N9MP2075B12B1 44001102002

User Manual: N9MP2075B12B1

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N9MP1 & N9MP2
*9MPD * Denotes Brands (C, H, T)
FAN ASSISTED, DIRECT
VENT GAS FURNACE
SAFETY REQUIREMENTS
Recognize safety information. This is the safety--alert symbol
the potential for personal injury.

! . When you see this symbol on the furnace and in instructions manuals be alert to

Understand the signal words DANGER, WARNING, or CAUTION. These words are used with the safety--alert symbol. DANGER identifies the
most serious hazards, those that will result in severe personal injury or death. WARNING signifies a hazard that could result in personal injury or
death. CAUTION is used to identify unsafe practices that could result in minor personal injury or product and property damage.
Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should
install, repair, or service heating equipment.
Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels attached
to or shipped with the unit and other safety precautions that may apply.
Follow all safety codes. In the United States, follow all safety codes including the current edition National Fuel Gas Code (NFGC) ANSI
Z223.1--2002/NFPA No. 54--2002. In Canada, refer to the current edition of the National Standard of Canada Natural Gas and Propane Installation
Code (NSCNGPIC) CSA B149.1--00. Wear safety glasses and work gloves. Have fire extinguisher available during start--up and adjustment
procedures and service calls.
These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these instructions
exceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We require
these instructions as a minimum for a safe installation.

INSTALLER: Affix these instructions
on or adjacent to the furnace.
CONSUMER: Retain these
instructions for future reference.
International Comfort Products Corporation (USA)

Table of Contents

Lewisburg, TN 37091 U.S.A.

1. Safe Installation Requirements . . . . . . . . . . . . . . . . .
2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Combustion & Ventilation Air . . . . . . . . . . . . . . . . . .
4. Vent & Combustion Air Piping . . . . . . . . . . . . . . . .
5. Gas Supply and Piping . . . . . . . . . . . . . . . . . . . . . .
6. Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . .

3
4
7
10
26
30

7. Ductwork and Filter . . . . . . . . . . . . . . . . . . . . . . . .
8. Checks and Adjustments . . . . . . . . . . . . . . . . . . . .
9. Furnace Maintenance . . . . . . . . . . . . . . . . . . . . . . .
10. Sequence of Operation & Diagnostics . . . . . . . . . .
11. Concentric Vent Termination . . . . . . . . . . . . . . . . .
Tech Support and Parts . . . . . . . . . . . . . . . . . . . . . . . .

!
Electric Shock Hazard
Turn Off All Power Before Servicing.
Failure to do so can result in death,
personal injury and/or property
damage.
Printed in U.S.A.

30
33
35
35
39
43

!
FIRE OR EXPLOSION HAZARD
This furnace is not designed for use in mobile
homes, trailers or recreational vehicles.
Such use could result in death, bodily injury
and/or property damage.

4/28/2003

440 01 1020 (02)

START--UP CHECK SHEET
For 90+ Furnace
(Keep this page for future reference)
Dealer Name:
Business Card Here

Address:
City, State(Province), Zip or Postal Code:

Phone:
Manual Gas Shut--Off Upstream

Owner Name:

of Furnace/Drip--Leg?

Address:

YES

Condensate Drain Connected?

City, State(Province), Zip or Postal Code:

Condensate Drain Trapped?

YES

NO
NO

YES

Transition Pressure switch hose relocated for U/D/H
Model Number:

Application? YES

Serial Number:

Blower Speed Checked?

Type of Gas:

Natural:

NO
YES

All Electrical Connections Tight?

LP:

Gas Valve OK?

YES

NO
YES

Which blower speed tap is used?
(Heating)

Measured Line Pressure When Firing Unit:

(Cooling)

Temperature of Supply Air:

(°F)

or(°C)

Temperature of Return Air:

(°F)

or(°C)

Rise (Supply Temp.--Return Temp.): (°F)
Filter Type and Size:

or(°C)

Calculated Firing Rate:(See Checks and Adjustments Section).
Temperature Rise (supply--return temperature):(°F)
Measured Manifold Gas Pressure:
Static Pressure (Ducts): Supply Air

Return

Date of Start--Up:
Fan “Time ON” Setting:
Fan “Time OFF” Setting:

CO ?
CO2 ?

Dealer Comments:

440 01 1020 02

1. Safe Installation Requirements
·

!
DEATH, PERSONAL INJURY AND/OR PROPERTY
DAMAGE
Failure to carefully read and follow all instructions
in this manual can result in furnace malfunction,
death, personal injury and/or property damage.
Installation or repairs made by unqualified persons
can result in hazards to you and others. Installation
MUST conform with local codes or, in the absence
of local codes, with codes of all governmental
authorities having jurisdiction.

Safety Rules
Your unit is built to provide many years of safe and dependable service providing it is properly installed and maintained. However,
abuse and/or improper use can shorten the life of the unit and
create hazards for you, the owner.
A.

The U.S. Consumer Product Safety Commission recommends that users of gas--burning appliances install carbon
monoxide detectors. There can be various sources of carbon
monoxide in a building or dwelling. The sources could be gas-fired clothes dryers, gas cooking stoves, water heaters, furnaces, gas--fired fireplaces, wood fireplaces, and several
other items.
Carbon monoxide can cause serious bodily injury and/or
death. Carbon monoxide or “CO” is a colorless and odorless
gas produced when fuel is not burned completely or when the
flame does not receive sufficient oxygen.
Therefore, to help alert people of potentially dangerous carbon monoxide levels, you should have carbon monoxide detectors that are listed by a nationally recognized agency (e.g.
Underwriters Laboratories or International Approval Services)
installed and maintained in the building or dwelling (see Note
below).

There can be numerous sources of fire or smoke in a building
or dwelling. Fire or smoke can cause serious bodily injury,
death, and/or property damage. Therefore, in order to alert
people of potentially dangerous fire or smoke, you should
have fire extinguisher and smoke detectors listed by Underwriters Laboratories installed and maintained in the building or
dwelling (see Note below).

The information contained in this manual is
intended for use by a qualified service technician
who is experienced in such work, who is familiar
with all precautions and safety procedures required
in such work, and is equipped with the proper tools
and test instruments.
NOTE: This furnace is design--certified by the CSA International
(formerly AGA and CGA) for installation in the United States and
Canada. Refer to the appropriate codes, along with this manual, for
proper installation.

Use only the Type of gas approved for this furnace (see
Rating Plate on unit). Overfiring will result in failure of heat
exchanger and cause dangerous operation. (Furnaces
can be converted to L.P. gas with approved kit.)

Install this furnace only in a location and position as specified in “2. Installation” of these instructions.

Provide adequate combustion and ventilation air to the furnace as specified in “3. Combustion and Ventilation Air” of
these instructions.

Combustion products must be discharged outdoors. Connect this furnace to an approved vent system only, as specified in “4. Vent and Combustion Air Piping” of these
instructions.

Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the
detection of leaks to check all connections, as specified in
“6. Gas Supply and Piping, Final Check” of these instructions.

Always install furnace to operate within the furnace’s intended temperature--rise range with a duct system which
has an external static pressure within the allowable range,
as specified in “Technical Support Manual” of these instructions.

When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a
duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

A gas--fired furnace for installation in a residential garage
must be installed as specified in “2. Installation” of these instructions.

This furnace is not to be used for temporary heating of
buildings or structures under construction.

This furnace is NOT approved for installation in mobile
homes, trailers or recreation vehicles.

·
·

Seal around supply and return air ducts.
Install correct filter type and size.

440 01 1020 02

Unit MUST be installed so electrical components are protected from direct contact with water.

Note: The manufacturer of your furnace does not test any detectors and makes no representations regarding any brand or
type of detector.
C. To ensure safe and efficient operation of your unit, you should
do the following:
1.

Thoroughly read this manual and labels on the unit. This
will help you understand how your unit operates and the hazards involved with gas and electricity.

Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit
and to replace any part of the control system and any gas control which has been under water.

Never obstruct the vent grilles, or any ducts that provide
air to the unit. Air must be provided for proper combustion
and ventilation of flue gases.

Frozen Water Pipe Hazard
!
FROZEN AND BURST WATER PIPE HAZARD
FaiIure to do so may result in burst water pipes, serious
property damage and/or personal injury.
Furnace may shut down. Do not leave your home
unattended for long periods during freezing weather
without turning off water supply and draining water pipes
or otherwise protecting against the risk of frozen pipes.
Your furnace is designed solely to provide a safe and comfortable
living environment. The furnace is NOT designed to ensure that
water pipes will not freeze. It is equipped with several safety devices that are designed to turn the furnace off and prevent it from
restarting in the event of various potentially unsafe conditions.

If your furnace remains off for an extended time, the pipes in your
home could freeze and burst, resulting in serious water damage.
Water may create a condition in which mold can grow in your home.
Certain types of mold have been reported to cause respiratory
problems or other serious health risks. Remedial actions, including
immediately drying all wet items, should be taken quickly to help
prevent the development of mold in your home.
If the structure will be unattended during cold weather you should
take these precautions.
1.

Install a reliable remote sensing device that will notify somebody of freezing conditions within the home.

Winter Shutdown
If you go away during the winter months and do not leave the heat
on in your home, the plastic transition box and the condensate trap
on the furnace must be protected from freeze damage.(See
Figure 8 trough Figure 17)
1.

Disconnect the 5/8² OD rubber hose from the vent drain fitting that is located downstream of the combustion blower. Insert a funnel into the hose and pour four(4) ounces of
sanitary type (RV) antifreeze into the condensate trap. Reconnect the 5/8² OD rubber hose to the stub on the vent drain
fitting. Secure with the hose clamp.

Disconnect the 3/4² OD rubber hose from the condensate
trap. Insert a funnel into the hose and and pour four(4)
ounces of sanitary type (RV) antifreeze into the plastic Transition box. Squeeze the hose together near the end and
quickly reconnect the 3/4² OD rubber hose to the stub on the
condensate trap. Secure with the hose clamp.

Turn off the water supply to the structure and drain the water
lines if possible and add an antifreeze for potable water to
drain traps and toilet tanks. Open faucets in appropriate
areas.
--or--

Have someone check the structure frequently during cold
weather to make sure it is warm enough to prevent pipes
from freezing. Instruct them on a service agency to call to
provide service, if required.
--or--

When you return home, your furnace will be ready to start, as it is
not necessary to drain the antifreeze from the furnace.

2. Installation
CARBON MONOXIDE POISONING HAZARD
Failure to properly vent this furnace or other appliances
can result in death, personal injury and/or property
damage.
This furnace can NOT be common vented or connected to
any type B, BW or L vent or vent connector, nor to any
portion of a factory--built or masonry chimney. If this
furnace is replacing a previously common-vented
furnace, it may be necessary to resize the existing vent
and chimney to prevent oversizing problems for the other
remaining appliance(s). See Venting and Combustion Air
Check in Gas Vent Installation section. This furnace MUST
be vented to the outside.

CAUTION
Special precautions MUST be made if installing furnace in an
area which may drop below freezing. This can cause improper
operation or damage to equipment. If furnace environment
has the potential of freezing, the drain trap and drainline must
be protected. The use of electric heat tape or RV antifreeze is
recommended for these installations. (See “Condensate Trap
Freeze Protection Section”)
Do NOT operate furnace in a corrosive atmosphere
containing chlorine, fluorine or any other damaging
chemicals. Refer to Combustion & Ventilation Air section,
Contaminated Combustion Air.

Figure 1

Aluminum or non- rusting shield recommended. (See
Vent Termination Shielding for dimensions).

Location and Clearances
4.

Refer to Figure 1 or Figure 2 for typical installation and basic connecting parts required. Refer to Figure 4 for typical
horizontal direct vent installation and basic connecting parts
required. Supply and return air plenums and duct are also
required.

If furnace is a replacement, it is usually best to install the furnace where the old one was. Choose the location or evaluate the existing location based upon the minimum clearance
and furnace dimensions (Figure 3).

Typical Upflow Installation

*8² Min.
20¢ Max.
in same
atmospheric
zone

Vent Pipes MUST be
supported Horizontally
and Vertically

Inlet Pipe (not
used on Single
Pipe model)

DISCHARGE AIR

Coupling on ends of
exhaust pipe. Total
pipe & coupling outside structure = 8²

*8² Min.
20¢ Max.
in same atmospheric
zone

* Increase minimum from 8² to 18² for cold climates (sustained temperatures below
0 ° F).

25--23--33

440 01 1020 02

Figure 2

preferred method is to use an angle iron frame bolted to the
rafters or joists.

Typical Downflow Installation
See Vent Termination
Shielding in Vent Section.

Inlet Pipe
(not used on
Single Pipe
model)

*8² Min.
20¢ Max.
in same
atmospheric zone

Vent Pipes MUST be
supported Horizontally
and Vertically

Coupling on inside
and outside of wall
to restrain vent pipe

This furnace may be used for construction heat provided that:

The furnace is permanently installed with all electrical wiring,
piping, venting and ducting installed according to these
installation instructions. A return air duct is provided, sealed
to the furnace casing, and terminated outside the space containing the furnace. This prevents a negative pressure condition as created by the circulating air blower, causing a
flame rollout and/or drawing combustion products into the
structure.

The furnace is controlled by a thermostat. It may not be “hot
wired” to provide heat continuously to the structure without
thermostatic control.

Clean outside air is provided for combustion. This is to minimize the corrosive effects of adhesives, sealers and other
construction materials. It also prevents the entrainment of
drywall dust into combustion air, which can cause fouling
and plugging of furnace components.

The temperature of the return air to the furnace is no less
than 55° F, with no evening setback or shutdown. The use of
the furnace while the structure is under construction is
deemed to be intermittent operation per our installation instructions.

The air temperature rise is within the rated rise range on the
furnace rating plate, and the firing rate has been set to the
rating plate value.

The filters used to clean the circulating air during the
construction process must be either changed or thoroughly
cleaned prior to occupancy.

The furnace, ductwork and filters are cleaned as necessary
to remove drywall dust and construction debris from all
HVAC system components after construction is completed.

8² Min.

*8² Min.
20¢ Max.
in same
atmospheric zone

* Increase minimum from 8² to 18² for cold climates (sustained temperatures
25--23--33a
below 0°F).

!
DEATH, PERSONAL INJURY AND/OR PROPERTY
DAMAGE HAZARD.
Failure to properly install this furnace can result in death,
personal injury and/or property damage.
Do NOT operate furnace in a corrosive atmosphere
containing chlorine, fluorine or any other damaging
chemicals.
Refer to Combustion & Ventilation Air section,
Contaminated Combustion Air for combustion air
evaluation and remedy.

Installation Requirements
1. Install furnace level.
2.

This furnace is NOT to be used for temporary heat of buildings
or structures under construction.

Install the vent pipes as short as practical. (See Gas Vent
Installation section).

Do NOT install furnace directly on carpeting, tile or other combustible material other than wood flooring.

Maintain clearance for fire safety and servicing. A front clearance of 30² is minimum for access to the burner, controls and
filter. See clearance requirements in Figure 3 or.

Use a raised base if the floor is damp or wet at times.

Residential garage installations require:

Burners and ignition sources installed at least 18² (457 mm)
above the floor.

Furnace must be located or physically protected from possible damage by a vehicle.

If the furnace is to be suspended from the floor joists in a basement or a crawl space or the rafters in an attic, it is necessary
to use steel pipe straps or an angle iron frame to attach the furnace. These straps should be attached to the furnace with
sheet metal screws and to the rafters or joists with bolts. The

440 01 1020 02

Installation Positions
This furnace can be installed in an upflow, horizontal (either left or
right) or downflow airflow position. DO NOT install this furnace on
its back. For the upflow position, the return air ductwork can be attached to either the left or right side panel and/or the bottom. For
horizontal and downflow positions, the return air ductwork must be
attached to the bottom. The return air ductwork must never be attached to the back of the furnace.

Furnace Installation Considerations
The installation of the furnace for a given application will dictate the
position of the furnace, the airflow, ductwork connections, vent and
combustion air piping. Consideration must be given to the following:

Condensate Trap and Drain Lines
The supplied condensate trap must be attached to the furnace side
panel on either the left or right side. For horizontal installations, the
drain trap is vertically attached to the side panel below the furnace.
A minimum clearance of 6² below the furnace is required for the
condensate trap. Downward slope of the condensate drain line
from the condensate trap to the drain location must be provided.
Adequate freeze protection of the drain trap and the drain line must
be provided. See “Condensate Drain Trap” section for further details.

Dimensions & Clearances

Figure 3

Cabinet to Combustible Clearances

AIR INTAKE
VENT (*9MPD)

TOP

BOT.

1²

0²

BACK FRONT
0²

3²

FLUE
0²

A
B

H
G
E

FRONT

811/16

LEFT SIDE

11/4

TRAP (COUNTERFLOW)

ELECTRICAL
11/16

GAS
VENT

1311/16

AIR INTAKE
(ALTERNATE)

3111/16

413/16
TRAP
UPFLOW/HORIZONTAL

13/8

297/8
283/4

THERMOSTAT

21/4

241/16
131/4

1913/16

175/16
111/16

215/8

17/8

47/8

11/4

27/8

BOTTOM

23/8
11/16

37/8

231/8

C
Unit

281/2

Cabinet

Bottom

TRAP (COUNTERFLOW)

N9MP1050B12A

151/2

13/8

125/8

----

N9MP1075B12A

151/2

13/8

125/8

----

N9MP1080F16A

191/8
191/8
223/4
223/4
151/2
151/2
191/8
191/8
223/4
223/4
191/8
191/8
223/4
223/4
223/4
241/2

175/8
175/8
211/4
211/4

21/8
21/8
115/16
115/16
13/8
13/8
21/8
21/8
115/16
115/16
21/8
21/8
115/16
115/16
115/16
7/
16

143/4

----

143/4
183/4
183/4
125/8
125/8
143/4
143/4
183/4
183/4
143/4
143/4
183/4
183/4
183/4

----

41/2

----

73/4

----

41/2

----

73/4

----

41/2

----

91/2

----

41/2
41/2
41/2
41/2
41/2
41/2
41/2
41/2
41/2

----

91/2
113/8
113/8
91/2
91/2
113/8
113/8
113/8
121/4

N9MP1100J20A
N9MP1125J20A
N9MP2050B12A
N9MP2075B12A
N9MP2080F16A
N9MP2100F14A
N9MP2100J20A
N9MP2125J20A
*9MPD050F12A
*9MPD075F12A
*9MPD080J16A
*9MPD100J14A
*9MPD100J20A
*9MPD125L20A

14
14
175/8
175/8
211/4
211/4
175/8
175/8
211/4
211/4
211/4
23

RIGHT SIDE

GAS

Top

Capacity

N9MP1100F14A

------43/8
43/8
43/8
43/8
43/8
43/8

1/
2
TYP.

181/2

45/16

------21/2
21/2
25/8
25/8
25/8
21/4

ELECTRICAL
AIR INTAKE
(ALTERNATE)
13/16

413/16

TRAP
UPFLOW/HORIZONTAL

111/16

297/8

273/16
913/16
3311/16

VENT

THERMOSTAT

215/8
175/16

21/4

191/4

111/16

47/8

215/8

17/8

25--23--36b

440 01 1020 02

Leveling
Proper leveling of the furnace must be provided to insure proper
drainage of the condensate from the furnace. The furnace must be
level to within 1/4² from front to back and from side to side for upflow
and downflow installations or top to bottom for horizontal installations.

combustion air pipes attach to the furnace through the alternate
locations on the furnace side panels.
Note: On the Direct Vent furnace, the vent pipe attaches to the furnace through the side panels. The combustion air pipe attaches to
the top panel or to the alternate location on the side panel.

Vent and Combustion Air Connections

On the Single Pipe furnace, the vent pipe attaches to the furnace
through the furnace side panels.

On the Dual Certified furnace, the vent and combustion air pipes
attach to the furnace through the top panel for the upflow and horizontal installations. For the downflow installation, the vent and

Note: Repositioning of the combustion blower is required for the
vent pipe connection to the furnace through the “right side” panel.
See “Vent and Combustion Air Piping” section for further details.

Horizontal Furnace Installation

If the furnace is to be suspended from the floor joists in a crawl
space or the rafters in an attic, it is necessary to use steel pipe
straps or an angle iron frame to rigidly attach the furnace to prevent
movement. These straps should be attached to the furnace with
sheet metal screws and to the rafters or joists with bolts. The preferred method is to use an angle iron frame bolted to the rafters or
joists. (Take caution to allow door panels to be removed for maintenance)

This furnace can be installed horizontally in an attic, basement,
crawl space, alcove, or suspended from a ceiling in a basement or
utility room . See Figure 4. Do not install furnace on its back or in
the reverse airflow positions as safety control operation will be adversely affected.

Typical Horizontal Installation

Figure 4

Inlet Pipe (not used on Single Pipe model)
Vent
Pipe

If the furnace is to be installed in a crawl space, consult local codes.
A suitable concrete pad or blocks are recommended for crawl
space installation on the ground.
NOTE: 6² bottom clearance required for condensate trap.
Thirty (30) inches between the front of the furnace and adjacent
construction or other appliances MUST be maintained for service
clearance.
Keep all insulating materials clear from louvered door. Insulating
materials may be combustible.

Condensate
Trap

The horizontal furnaces may be installed directly on combustible
wood flooring or supports as long as all required furnace clearances are met. See Figure 4.
This furnace MUST NOT be installed directly on carpeting or tile or
other combustible material other than wood flooring or supports.
25--23--34
NOTE: 6²² bottom clearance required for condensate trap.

3. Combustion & Ventilation Air
For Single Pipe Installation
!
CARBON MONOXIDE POISONING HAZARD
Failure to provide adequate combustion and ventilation
air can result in death and/or personal injury.
Use methods described here to provide combustion and
ventilation air.
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or openings for supplying combustion and ventilation air must comply with
National Fuel Gas Code, NFPA54/ANSI Z223.1, 2002 (or current
edition) and applicable provisions of local building codes.
This furnace can NOT be common vented or connected to any type
B, BW or L vent or vent connector, nor to any portion of a factory-built or masonry chimney. If this furnace is replacing a previously
common-vented furnace, it may be necessary to resize the existing
vent and chimney to prevent oversizing problems for the other remaining appliance(s). See “Venting and Combustion Air Check” in
this section. This furnace MUST be vented to the outside.
440 01 1020 02

For horizontal installation over a finished living space. A field fabricated auxiliary drain pan with drain pipe is required to prevent damage by overflow due to blocked condensate drain.

Air Openings and Connecting Ducts
1.

Total input rating for all non direct vent gas appliances MUST
be considered when determining free area of openings.

Connect ducts or openings directly to outside.

When screens are used to cover openings, they MUST be
no less than 1/4² mesh.

The minimum dimension of rectangular air ducts MUST
NOT be less than 3².

When sizing grille or louver, use the free area of opening. If
free area is NOT stamped or marked on grill or louver, assume a 20% free area for wood and 60% for metal.

Confined Space Installation
NOTE: A confined space is defined as an area with less than 50
cubic feet per 1,000 BTUH input rating for all gas appliances
installed in the area.

Requirements
1.

Provide confined space with sufficient air for proper combustion and ventilation of flue gases using horizontal or vertical ducts or openings.

Figure 5 illustrate how to provide combustion and ventilation air. A minimum of two permanent openings, one inlet
and one outlet, are required.

Figure 5

One opening MUST be within 12² of the floor and the second
opening within 12² of the ceiling.

Outside Air (This is ONLY a guide. Subject to codes of country having jurisdiction.)
This installation NOT approved in Canada

Gas Vent

Gable Vent
Gas Vent

Ventilated Attic
Top Above Insulation
alternate Inlet Air (1)

Gable Vent
Gas Vent
Ventilated Attic

Soffit Vent

Outlet Air (1)

Outlet
Air (2)

Outlet
Air (1)

Top Above Insulation

Soffit Vent

OutletAir (1)

Inlet
Air (1)

Inlet
Air (2)

Minimum One Inlet and One Outlet Air Supply is Required
May be in any Combination Shown
Inlet Air Opening Must be Within12² of floor

Inlet
Air (1)

Ventilated Crawl Space
alternate Inlet Air (1)

Inlet
Air (2)

Outlet Air Opening Must be Within12² of ceiling
(1) 1 Square Inch per 4000 BTUH
(2) 1 Square Inch per 2000 BTUH

Unconfined Space Installation

Size openings and ducts per Table 1.

Horizontal duct openings require 1 square inch of free area
per 2,000 BTUH of combined input for all gas appliances in
area (see Table 1).

Vertical duct openings or openings directly to outside require 1 square inch of free area per 4,000 BTUH for combined input of all gas appliances in area (see Table 1).

Table 1

!
CARBON MONOXIDE POISONING HAZARD
Failure to supply additional air by means of ventilation
grilles or ducts could result in death and/or personal
injury.
An unconfined space or homes with tight construction
may not have adequate air infiltration for proper
combustion and ventilation of flue gases.

Free Area

Most homes will require additional air.

Minimum Free Area Required for Each Opening

BTUH
Input
Rating

Horizontal Duct
(2,000 BTUH)

Vertical Duct or openings
to outside (4,000 BTUH)

Round Duct
(4,000 BTUH)

50,000

25 sq. in.

12.5 sq. in.

4²

75,000

37.5 sq. in.

18.75 sq. in.

5²

100,000

50 sq. in.

25 sq. in.

6²

125,000

62.5 sq. in.

31.25 sq. in.

7²

150,000

75 sq. in.

37.5 sq. in.

7²

An unconfined space is defined as an area having a minimum volume of 50 cubic feet per 1,000 Btuh total input rating for all gas appliances in area. Refer to Table 2 for minimum area required.

Table 2

Unconfined Space
Minimum Area in Square Feet

BTUH Input
Rating

Minimum Area in Square Feet

50,000

312

78,000

490

114,000

712

155,000

968

EXAMPLE: Determining Free Area
Appliance 1 Appliance 2

Total Input

100,000 + 30,000 = (130,000 ¸ 4,000) = 32.5 Sq. In. Vertical
Appliance 1 Appliance 2

Total Input

100,000 + 30,000 = (130,000 ¸ 2,000) = 65 Sq. In. Horizontal

One permanent opening, commencing within 12² of the top of the
enclosure, shall be permitted where the equipment has clearances
of at least 1² from the sides and back and 6² from the front of the
appliance. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to
the outdoors or spaces (crawl or attic) that freely communicate with
the outdoors, and shall have a minimum free area of:
·

1 sq. in per 3000 Btu per hr. of the total input rating of all
equipment located in the enclosure, and

Not less than the sum of the areas of all vent connectors in
the confined space.

EXAMPLE: NOTE: Square feet is based on 8 foot ceilings.
28,000 BTUH X 50 Cubic Ft. =
1,400
= 175 Sq. Ft.
1,000
8¢ Ceiling Height

NOTE: Refer to definitions in section titled Unusually Tight
Construction. If any one of the conditions apply, the space MUST
be considered confined space regardless of size.
1. Adjoining rooms can be considered part of an unconfined
area if there are openings without doors between rooms.
2.

An attic or crawl space may be considered an unconfined
space provided there are adequate ventilation openings directly to outdoors. Openings MUST remain open and NOT
have any means of being closed off. Ventilation openings to
outdoors MUST be at least 1² square of free area per 4,000
BTUH of total input rating for all gas appliances in area.
440 01 1020 02

Install air intake a minimum of 12² above maximum snow
level and clear of any obstruction. Duct or ventilation opening requires one square inch of free area per 4,000 BTUH of
total input rating for all gas appliances in area.
Air inlet MUST be screened with not less than 1/4² mesh
screen.

Unusually Tight Construction
In unconfined spaces, infiltration may be adequate to provide air
for combustion, ventilation and dilution of flue gases. However, in
buildings with unusually tight construction, additional air MUST be
provided using the methods described in section titled Confined
Space Installation:

!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being placed
into operation, while all other appliances connected to
the venting system are not in operation could result in
carbon monoxide poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.

Walls and ceilings exposed to the outside have a continuous, sealed vapor barrier. Openings are gasketed or sealed
and

Doors and openable windows are weather stripped and

2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or CSA B149.1, Natural Gas and Propane Installation Codes and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

Other openings are caulked or sealed. These include joints
around window and door frames, between sole plates and
floors, between wall--ceiling joints, between wall panels, at
penetrations for plumbing, electrical and gas lines, etc.

3. As far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)
connected to the venting system are located and other
spaces of the building.

Unusually tight construction is defined as: Construction with

Ventilation Air
Some provincial codes and local municipalities require ventilation
or make--up air be brought into the conditioned space as replacement air. Whichever method is used, the mixed return air temperature across the heat exchanger MUST not fall below 60°F or flue
gases will condense in the heat exchanger. This will shorten the life
of the heat exchanger and possibly void your warranty.

4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected
to the venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will operating at maximum speed. Do not operate a summer exhaust
fan.
6. Follow the lighting instructions. Place the appliance being
inspected into operation. Adjust thermostat so appliance
is operating continuously.

Venting and Combustion Air Check

7. Test for spillage from draft hood equipped appliances at
the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle. (Figure 6)

NOTE: When an existing Category I furnace is removed or replaced, the original venting system may no longer be sized to properly vent the attached appliances, and to make sure there is
adequate combustion air for all appliances, MAKE THE FOLLOWING CHECK.

8. If improper venting is observed, during any of the above
tests, the venting system must be corrected in accordance with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and
Propane Installation Codes.

Figure 6

Vent Check

Vent Pipe
Typical Gas
Water Heater

9. After it has been determined that each appliance connected to the venting system properly vents when tested
as outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas--fired burning appliance to their previous conditions of use.
Draft Hood

For Two Pipe Installation
Match

If flame pulls towards draft hood, this indicates sufficient
venting.

440 01 1020 02

This furnace can NOT be common vented or connected to any type
B, BW or L vent or vent connector, nor to any portion of a factory-built or masonry chimney. If this furnace is replacing a previously
common-vented furnace, it may be necessary to resize the existing
vent and chimney to prevent oversizing problems for the other remaining appliance(s). See “Venting and Combustion Air Check” in
this section. This furnace MUST be vented to the outside.

4. Vent and Combustion Air Piping
!
CARBON MONOXIDE POISONING, FIRE AND EXPLOSION
HAZARD
Failure to properly vent this furnace can result in death,
personal injury and/or property damage.
Read and follow all instructions in this section.

Single Pipe (N9MP1 Models)
This furnace is certified as a category IV appliance. This furnace
requires ventilation openings to provide air for proper combustion
and ventilation of flue gases. All duct or openings for supplying
combustion and ventilation air must comply with the gas codes or
in absence of local codes, the applicable national codes.
When the installation is complete, see the “Venting and Combustion Air Check” in this manual.

Direct Vent (N9MP2 Models)
This furnace is certified as a category IV appliance. This furnace
uses outside air for combustion ONLY, it MUST be taken from the
same atmospheric pressure zone as the vent pipe. See Confined
Space Installation in the Combustion and Ventilation Air in this
manual.

Dual Certified (*9MPD Models)
This furnace is certified as a category IV appliance. This furnace
can be installed as a direct vent furnace using outside air for combustion or the furnace can use air from inside the structure for combustion. The INLET air pipe is optional. If combustion air comes
from inside the structure, adequate make up air MUST be provided
to compensate for oxygen burned. See Confined Space Installation in the Combustion and Ventilation Air chapter. If combustion air is drawn from outside the structure, it MUST be taken from
the same atmospheric pressure zone as the vent pipe.

Contaminated Combustion Air
Installations in certain areas or types of structures will increase the
exposure to chemicals or halogens that may harm the furnace.
The following areas or types of structures may contain or have exposure to the substances listed below. The installation must be
evaluated carefully as it may be necessary to provide outside air for
combustion.

·
·
·
·
·
·
·
·
·
·
·
·
·
·
·

Commercial buildings.
Buildings with indoor pools.
Furnaces installed in laundry rooms.
Furnaces installed in hobby or craft rooms.
Furnaces installed near chemical storage areas.
Permanent wave solutions for hair.
Chlorinated waxes and cleaners.
Chlorine based swimming pool chemicals.
Water softening chemicals.
De--icing salts or chemicals.
Carbon tetrachloride.
Halogen type refrigerants.
Cleaning solvents (such as perchloroethylene).
Printing inks, paint removers, varnishes, etc.
Hydrochloric acid.

·
·
·
·

Sulfuric Acid.
Solvent cements and glues.
Antistatic fabric softeners for clothes dryers.
Masonry acid washing materials.

Vent and Combustion Air Piping Guidelines
This furnace is approved for venting with Schedule 40 PVC, CPVC,
ABS, Cellular Core pipe fittings and SDR--26 PVC.
NOTE: All PVC, CPVC, ABS, and Cellular Core pipe fittings, solvent cement, primers and procedures MUST conform to American
National Standard Institute and American Society for Testing and
Materials (ANSI/ASTM) standards.

Pipe and Fittings -- ASTM D1785, D2241, D2466, D2661,
D2665, F--891, F--628
·
PVC Primer and Solvent Cement -- ASTM D2564
·
Procedure for Cementing Joints -- Ref ASTM D2855
NOTE: All vent piping MUST be installed in compliance with local
codes or ordinances, these instructions, good trade practices, and
codes of country having jurisdiction.
1. Determine the best routing and termination for the vent pipe
and air inlet pipe by referring to all of the instructions and
guidelines in this Section.
2. Determine the size required for the vent pipe and air inlet
pipe.
3. Loosely assemble all venting parts without adhesive (pipe
joint cement) for correct fit before final assembly.
4. Use of vertical piping is preferred because there will be
some moisture in the flue gases that may condense as it
leaves the vent pipe (See Special Instruction For Horizontal
Vents).
5. The vertical vent pipe MUST be supported so that no weight
is allowed to rest on the combustion blower.
6. Exhaust vent piping or air inlet piping diameter MUST NOT
be reduced.
7. All exhaust vent piping from the furnace to termination
MUST slope upwards. A minimum of 1/4² per foot of run is
required to properly return condensate to the furnace drain
system.
8. Use DWV type long radius elbows whenever possible, as
they provide for the minimum slope on horizontal runs and
they provide less resistance in the vent system. If DWV elbows cannot be used, use two, 45° elbows when possible.
On horizontal runs the elbows can be slightly misaligned to
provide the correct slope.
9. All horizontal pipe runs MUST be supported at least every
five feet with galvanized strap or other rust resistant material. NO sags or dips are permitted.
10. All vertical pipe runs MUST be supported every six feet
where accessible.
11. The minimum pipe run length is 2¢.
12. The piping can be run in the same chase or adjacent to supply or vent pipe for water supply or waste plumbing. It can
also be run in the same chase with a vent from another 90+
furnace.
NOTE: In NO case can the piping be run in a chase where
temperatures can exceed 140° F. or where radiated heat
from adjacent surfaces would exceed 140° F.
13. The vent outlet MUST be installed to terminate in the same
atmospheric pressure zone as the combustion air inlet.
14. The vent system can be installed in an existing unused chimney provided that:
440 01 1020 02

· Both the exhaust vent and air intake run the length of the
chimney.

· No other gas fired appliance or fireplace (solid fuel) is
vented into the chimney.

NOTE: It is allowable to use larger diameter pipe and fitting than
shown in the tables but not smaller diameters than shown.

Table 4

· The top of the chimney MUST be sealed flush or crowned

50,000 & 80,000 Btuh Furnaces

up to seal against rain or melting snow so ONLY the piping
protrudes.

40¢ & (5) 90° elbows with 2² PVC pipe or
70¢ & (5) 90° elbows with 3² PVC pipe

· The termination clearances shown in Figure 7 are main-

75,000 Btuh Furnaces

tained.
15. Furnace applications with vertical vents requiring vent diameter increaser fittings must have increaser fittings installed
in vertical portion of the vent. Condensate will be trapped in
the vent if the vent diameter is increased prior to having an
elbow turned upward. This could cause nuisance tripping of
the pressure switch.

25¢ & (3) 90° elbows with 2² PVC pipe or
40¢ & (5) 90° elbows with 2² PVC pipe &
Long Vent Kit (See Tech. Manual) or
70¢ & (5) 90° elbows with 3² PVC pipe

100,000 Btuh Furnace
40¢ & (5) 90° elbows with 3² PVC pipe or
70¢ & (5) 90° elbows with 3² PVC pipe &
Long Vent Kit (See Tech. Manual)

Piping Insulation Guidelines
NOTE: Use closed cell, neoprene insulation or equivalent. If Fiberglass or equivalent insulation is used it must have a vapor barrier.
Use R values of 7 up to 10¢, R--11 if exposure exceeds 10¢. If Fiberglass insulation is used, exterior to the structure, the pipe MUST be
boxed in and sealed against moisture.
1.

When the vent or combustion air pipe height above the roof
exceeds 30², or if an exterior vertical riser is used on a horizontal vent to get above snow levels, the exterior portion
MUST be insulated.
When combustion air inlet piping is installed above a suspended ceiling, the pipe MUST be insulated with moisture
resistant insulation such as Armaflex or other equivalent
type of insulation.
Insulate combustion air inlet piping when run in warm, humid
spaces such as basements.

Pipe Diameter Table
N9MP2 Models

125,000 Btuh Furnace
40¢ & (5) 90° elbows with 3² PVC pipe
Elbows are DWV Long Radius Type for 2² and 3² vents.

If more than five elbows are required, reduce the length of
both the inlet and exhaust pipes 5¢ for each additional elbow
used.

For “Concentric Termination Kit” Venting table, see
“Section 11” in this manual.

Vent Termination Clearances
!
CARBON MONOXIDE POISONING, FIRE AND EXPLOSION
HAZARD

Sizing Combustion Air and Vent Pipe

Failure to properly vent this furnace can result in death,
personal injury and/or property damage.

Consult Table 3 or Table 4 to select the proper diameter exhaust
and combustion air piping. Exhaust and combustion air piping is
sized for each furnace Btuh size based on total lineal vent length
(on inlet or outlet side), and number of 90° elbows required. Two
45° elbows can be substituted for one 90° elbow. The elbow or elbows used for vent termination outside the structure ARE counted,
including elbows needed to bring termination above expected
snow levels. The elbow inside the furnace on the *9MPD IS NOT
included in the count.

Inlet and outlet pipes may NOT be vented directly above
each other.

Pipe Diameter Table
N9MP1 & *9MPD Models

Table 3

50,000, 75,000 & 80,000 Btuh Furnaces

For “Concentric Termination Kit” clearances, see Figure 45,
Figure 46, Figure 47, Figure 48 and Figure 49 in “Section 10”
in this manual.
2.

The vent termination must be located at least 12² above
ground or normally expected snow accumulation levels.

Do NOT terminate over public walkways. Avoid areas where
condensate may cause problems such as above planters,
patios, or adjacent to windows where steam may cause fogging.

The vent termination shall be located at least 4¢ horizontally
from any electric meter, gas meter, regulator, and any relief
equipment. These distances apply ONLY to U.S. installations.

The vent termination is to be located at least 3¢ above any
forced air inlet located within 10¢ ; and at least 10¢ from a
combustion air intake of another appliance, except another
direct vent furnace intake.

In Canada, the Canadian Fuel Gas Code takes precedence
over the preceding termination instructions.

40¢ & (5) 90° elbows with 2² PVC pipe or
70¢ & (5) 90° elbows with 3² PVC pipe

100,000 Btuh Furnace
40¢ & (5) 90° elbows with 3² PVC pipe or
70¢ & (5) 90° elbows with 3² PVC pipe &
Long Vent Kit (See Tech. Manual)

125,000 Btuh Furnace
40¢ & (5) 90° elbows with 3² PVC pipe
Elbows are DWV Long Radius Type for 2² and 3² vents.

If more than five elbows are required, reduce the length of
both the inlet and exhaust pipes 5¢ for each additional elbow
used.

440 01 1020 02

Determine termination locations based on clearances specified in following steps and as shown in Figure 7,
Figure 19, through Figure 27.

Vent Termination Clearances
(United States Only)

Figure 7

In Canada See Canadian Fuel Gas Code
Other Than
Direct Vent
Terminal
Other Than
Direct Vent
Terminal

9²

The drain line must maintain a 1/4² per foot downward slope toward
the drain. 1/4² per foot is recommended. Installation of an overflow
line is recommended when the 1/4² per foot slope to the condensate drain cannot be maintained. See Figure 1 for proper routing
and installation of the overflow.

10¢¢
4¢¢

Direct Vent
12²²
Terminal
50,000 Btuh
or less
Other Than
Direct Vent
Terminal

3¢¢

12²²

FROZEN AND BURST WATER PIPE HAZARD
Failure to do so may result in burst water pipes, serious
property damage and/or personal injury.

12²²

Forced Air
Inlet

Direct Vent Terminal
More Than 50,000 Btuh

10--11--36

Condensate Drain Trap
This furnace removes both sensible and latent heat from the products of combustion. Removal of the latent heat results in condensation of the water vapor. The condensate is removed from the
furnace through the drains in the plastic transition and the vent fitting. The drains connect to the externally mounted condensate
drain trap on the left or right side of the furnace.
The startup of a new furnace will involve a cycle or two of the furnace to properly prime the condensate trap with water. Until the
trap is fully primed, some condensate will be pulled into the combustion blower. The furnace may cycle on the pressure switch connected to the plastic transition box due to condensate buildup.
After the trap is primed, the condensate will start draining from the
furnace. The combustion blower will clear out any remaining condensate in the blower housing through the vent fitting downstream
of the blower. Note that the condensate trap can also be primed by
pouring water into the 1/2² drain hose. Remove the1/2² ID drain
hose from either the gutter or the white PVC Tee Trap. Using a funnel pour eight (8) ounces of water into 1/2² ID drain hose.Water will
flow through the drain hose and into the condensate drain trap.
This will prime both the vent and the transition sides of the trap. Reconnect the 1/2² ID drain hose to the original component, either the
gutter or the PVC Tee Trap.
The condensate drain trap supplied with the furnace MUST be
used. The drain connection on the condensate drain trap is sized
for 3/4² PVC or CPVC pipe, however alternate 1/2² CPVC (nominal
5/ ² O.D.) or vinyl tubing with a minimum inner diameter (I.D.) of
8

8² may also be used, as allowed by local codes. Alternate drain
pipes and hoses may be used as allowed by local codes.

DO NOT trap the drain line in any other location than at the condensate drain trap supplied with the furnace.

4¢¢
12²²

If a condensate pump is installed, a plugged condensate
drain or a failed pump may cause the furnace to shut down.
Do not leave the home unattended during freezing weather
without turning off water supply and draining water pipes
or otherwise protecting against the risk of frozen pipes.
If possible DO NOT route the drain line where it may freeze. The
drain line must terminate at an inside drain to prevent freezing of
the condensate and possible property damage.
1.

A condensate sump pump MUST be used if required by local
codes, or if no indoor floor drain is available. The condensate pump must be approved for use with acidic condensate.

A plugged condensate drain line or a failed condensate
pump will allow condensate to spill. If the furnace is installed
where a condensate spill could cause damage, it is recommended that an auxiliary safety switch be installed to prevent operation of the equipment in the event of pump failure
or plugged drain line. If used, an auxiliary safety switch
should be installed in the R circuit (low voltage) ONLY.

If the auxiliary switch in the condensate pump is used, the
furnace may shut down due to a blocked condensate line or
failed pump. To prevent frozen water pipes see the “Frozen
Water Pipe Hazard” section on Page 4 of this manual.

Condensate Drain Trap Freeze Protection
Special precautions MUST be made if installing furnace in an area
which may drop below freezing. This can cause improper operation or damage to the equipment. If the the furnace environment
has the potential of freezing, the drain trap and drain line must be
protected. Use 3 to 6 watt per foot at 115 volt, 40° F self--regulating
shielded and waterproof heat tape. Wrap the drain trap and drain
line with the heat tape and secure with the ties. Follow the heat tape
manufacturer’s recommendations.

440 01 1020 02

Upflow Installations Top Vent

Yellow or black Plastic
Caps (2)

INLET

EXHAUST

Figure 8

On Some Models
ONLY

Coupling & Clamps
(Optional)

Vent Drain
& Clamps

AIR FLOW

Dual Pressure Switch Detail

Single Pressure Switch
Drain Tee

3/ ² ID Rubber Tube
16

1/ ² ID Drain
2

Hose & Clamps

5/ ² ID Hose & Clamps
8

Street Elbow
1/ ² CPVC
2
(Loose parts bag)

Drain Connector Black PVC

3/ ² PVC X 1/ ² CPVC
4
2

(Loose parts bag)
Casing Grommet
Black Rubber
5/ ² ID
8
(Loose parts bag)

Drain Line Vent Tee 3/4² PVC or
1/ ² CPVC (Field supplied)
2

Drain Tube (& Clamps) Black Rubber 5/8² ID,
Cut length to fit (Loose parts bag)

25--24--42

Upflow Installations Top Vent (See Figure 8)
Remove plug from the side of the furnace casing where Drain Tube
will exit.
Install casing grommet (black rubber 5/8² ID grommet -- in loose
parts bag)
Install the 1/2² CPVC street elbow on discharge of Trap
Install the black PVC tube connector (3/4² PVC x 1/2² CPVC from
loose parts bag) as shown in the illustration above.
Cut the black Drain Tube (5/8² ID -- in loose parts bag) to length to
fit between Trap and tube connector through grommet.
Clamp both ends of the Drain Tube using clamps provided.

440 01 1020 02

Glue the CPVC street elbow to the Trap using appropriate cleaner
and solvent cement.
Connect the Tee trap and the main drain line exiting the casing as
shown Figure 17.
Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Trap must be
primed before operation. Verify all condensate drain connections are securely clamped. A coupling and clamps (in loose part
bag) may be installed as shown for future servicing of the vent system.

Figure 9

Upflow Installations Vent thru Left Side

INLET

Coupling & Clamps
(Optional)

EXHAUST

Yellow or black Plastic
Cap

2²² PVC Coupling

On Some Models
ONLY

Vent Drain
& Clamps

Either: The PVC
Drain Tee or a field
supplied 2²² PVC Tee
Dual Pressure Switch Detail
AIR FLOW

Single Pressure Switch
3/ ² ID Rubber Tube
16

Tee Trap White PVC
(loose parts bag)
1/ ² ID Drain Tube
2

Drain Connector Black PVC
3/ ² PVC X 1/ ² CPVC
4
2
(Loose parts bag)

Black (Move from
bottom of drain tee
if installed)

5/ ² ID Hose
8
& Clamps

SIDE VIEW
Rotate downward
5°° to 10°°

Casing Grommet
Black Rubber
5/ ² ID
8
(Loose parts bag)
NOTE: Built--in channel will
be angled 5° to 10° also.

Drain Line Vent Tee 3/4² PVC or 1/2² CPVC (Field supplied)

25--24--43

Upflow Installations Vent thru Left Side (See Figure 9)
Remove Drain Tee from inducer discharge and remove black Drain
Tube (1/2² ID) from bottom of Drain Tee. (*9MPD models only)

Cut the black Drain Tube (5/8² ID -- in loose parts bag) to length to
fit between Trap and tube connector through grommet.

Install Vent Pipe grommet in side of casing.

Clamp both ends of the Drain Tube using clamps provided.

Cut an appropriate length of 2² PVC pipe long enough to exit the
cabinet and connect the vent drain to either:
· A standard field supplied 2² PVC tee (N9MP1 and 2 models),
or
· A 2² PVC coupling fastened onto the Drain Tee (*9MPD models)
Install Tee trap into bottom of tee.
Install the 1/2² CPVC street elbow on discharge of Trap
Install the black PVC drain connector (3/4² PVC x 1/2² CPVC from
loose parts bag) as shown in the illustration above.

Glue the CPVC street elbow to the Trap using appropriate cleaner
and solvent cement.
Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 17.
Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both the internal Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be
installed as shown for future servicing of the vent system.

440 01 1020 02

Figure 10

All Models Vent thru Right Side
Yellow or black Plastic
Cap

INLET

On Some Models
ONLY

2²² PVC Coupling

Vent Drain
& Clamps

Either: The PVC
Drain Tee or a field
supplied 2²² PVC Tee
Single Pressure Switch Detain

Dual Pressure Switch
3/ ² ID
16
Rubber
Tube

AIR FLOW

5/ ² ID Hose
8
& Clamps

Tee Trap White PVC
(loose parts bag)

Elbows Tubes (2) & Clamps Black,
1/ ² ID (loose parts bag)
2
Barbed Coupling, 1/2² OD
(loose parts bag)

Drain Line Vent Tee 3/4² PVC
or 1/2² CPVC (Field supplied)

SIDE VIEW

Rotate downward
5°° to 10°°

NOTE: Built--in channel will
be angled 5° to 10° also.

Drain Connector Black PVC
3/ ² PVC X 1/ ² CPVC
4
2
(Loose parts bag)

Casing Grommet
Black Rubber 5/8² CPVC
(Loose parts bag)
25--24--44

All Models Vent thru Right Side (See Figure 10)
Disconnect the black Drain Tube between the drain vent and the
Trap.

Install casing grommet (black rubber 5/8² ID grommet -- in loose
parts bag)

Rotate the inducer 180° for a right side vent after loosening the 4
inducer attachment screws. Reinstall and retighten the inducer
screws to 20² pounds torque.

Install the 1/2² CPVC street elbow on discharge of Trap

Using the 1/2² OD barbed coupling in the loose parts bag connect
together with the 2 short 1/2² ID elbow tubes and connect the lower
discharge port of the vent drain to the Trap. Secure all connections
with clamps.
Install the vent pipe grommet into the casing
Cut an appropriate length of 2² PVC pipe long enough to exit the
cabinet and connect the vent drain to either:
·

A standard field supplied 2² PVC tee (N9MP1 and 2 models), or

A 2² PVC coupling fastened onto the Drain Tee (*9MPD
models)

Install Tee Trap into bottom section of Tee.
Remove plug from the side of the furnace casing where Drain Tube
will exit.
440 01 1020 02

Install the black PVC tube connector (3/4² PVC x 1/2² CPVC from
loose parts bag) as shown in the illustration above
Cut the black Drain Tube (5/8² ID -- in loose parts bag) to length to
fit between Trap and tube connector through grommet.
Clamp both ends of the Drain Tube using clamps provided.
Glue the CPVC street elbow to the Trap using appropriate cleaner
and solvent cement.
Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 17.
Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both the internal Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be
installed as shown for future servicing of the vent system.

Figure 11

Downflow Left Side Vent and Trap
SIDE VIEW

Yellow or black Plastic
Cap

EXHAUST

Coupling & Clamps
(Optional)

Rotate downward
5°° to 10°°

2²² PVC Coupling
NOTE: Built--in channel will
be angled 5° to 10° also.

Vent Drain
& Clamps

Either: The PVC
Drain Tee or a field
supplied 2²² PVC Tee

Dual Pressure Switch

3/ ² ID
16

AIR FLOW

Rubber Tube

Tee Trap White PVC
(loose parts bag)

On Some Models
ONLY

INLET

1/ ² ID
2
Drain
Hose

Single Pressure Switch Detail

Flexible Tubing Connector,
3/ ² OD (loose parts bag)
16

AIR FLOW

Drain
Elbow (1)
WARNING
Move Caps
to top of
trap

Relief Tube,
Extension Black,
3/ ² ID Cut to fit
16
(loose parts bag)
Trap Connection

“Clamp ears”
Pointed OUT

Drain Tube Black, 5/8² ID Corrugated
Cut at straight section

Leave room for clamp

Preassemble &
insert into furnace

Cut Here

25--24--45

Downflow Left Side Vent and Trap (See Figure 11)
Remove the inducer mounting screws, rotate the inducer 180° and
retighten the inducer screws to 20² pounds torque.
Disconnect the hoses from the Trap assembly, and remove Trap
and Trap mounting bracket from the blower compartment. Using
cover plate and gasket provided in the loose parts bag, cover the
hole from the burner compartment to the blower compartment and
secure with screws.
Move the caps to the top of the Trap and mount the Trap externally
to the left side of the unit using the 2 screws provided.
Cut the 5/8² ID corrugated hose as shown above and fasten the 90°
bend end to the Trap and fasten the straight end to the transition
drain. Secure both connections with clamps.
Reconnect the 1/2² ID drain hose from the vent drain to the Trap
and secure with a clamp.. In some cases, additional length will be
required for this hose. Use the Black plastic 1/2² OD barbed coupling and a suitable section of 1/2² ID hose to make the connection.
Secure all connections with clamps
Connect the 3/16² ID relief tube from the small port on the Trap to
the top port of the transition as shown in the picture. In some cases,

additional hose length will be needed. Use the clear plastic 3/16²
OD flexible tubing connector and a suitable length of extra 3/16² ID
hose to make this connection.
Install the vent pipe grommet into the casing
Cut an appropriate length of 2² PVC pipe long , enough to exit the
cabinet and connect the vent drain to either:
·

A standard field supplied 2² PVC tee (N9MP1 and 2 models), or

A 2² PVC coupling fastened onto the Drain Tee (*9MPD
models)

Install Tee Trap into bottom section of Tee.
Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 17.
Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both the external Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be
installed as shown for future servicing of the vent system.
440 01 1020 02

Figure 12

Downflow Right Side Vent and Trap
Yellow or black Plastic
Cap

Trap Connection

Vent Drain
& Clamps

“Clamp ears”
Pointed OUT

Preassemble &
insert into furnace

SIDE VIEW

3/ ² ID
16
Rubber Tube

Rotate downward
5°° to 10°°

Splice Connector
Barbed
Dual Pressure Switch

1/ ² ID
2

Drain Hose &
Clamps

Coupling & Clamps
(Optional)

NOTE: Built--in channel will
be angled 5° to 10° also.

2²² PVC Coupling

INLET

On Some
Models ONLY

Single Pressure Switch Detail

AIR FLOW

Either: The PVC
Drain Tee or a field
supplied 2²² PVC Tee

AIR
FLOW

Drain Tube Black, 5/8²
ID Corrugated

Drain Connector Black
PVC 3/4² PVC X 1/2² CPVC
(Loose parts bag)

WARNING
Move Caps
to top of
trap

Tee Trap White PVC
(loose parts bag)

Drain Tube, (& Clamps)
Black, 5/8² ID Cut to fit
(loose parts bag)
25--24--46

Downflow Right Side Vent and Trap (See Figure 12)
Remove the Drain Tee if installed.

Install the vent pipe grommet into the casing

Disconnect the hoses from the Trap assembly, and remove Trap
and Trap mounting bracket from the blower compartment. Using
cover plate and gasket provided in the loose parts bag, cover the
hole from the burner compartment to the blower compartment and
secure with screws.

Cut an appropriate length of 2² PVC pipe long , enough to exit the
cabinet and connect the vent drain to either:

Move the caps to the top of the Trap and mount the Trap externally
to the right side of the unit using the 2 screws provided.
Connect the corrugated Drain Tube from the transition box to the
Trap as shown. If an extension is required, use the black PVC tube
connector and the black 5/8² ID Drain Tube in the loose parts bag.
Cut tube to length. Secure all connections with clamps.
Connect the drain hose from the Vent Drain to the Trap. If an extension is required, use the black 1/2² OD barbed coupling, connect
a black 1/2² ID elbow tube and a suitable section of a 1/2² ID drain
tube to make connection from the vent drain to the trap. Secure all
connections with clamps.

440 01 1020 02

A standard field supplied 2² PVC tee (N9MP1 and 2 models), or

A 2² PVC coupling fastened onto the Drain Tee (*9MPD
models)

Figure 13

Horizontal Left Thru Top

Vent Drain
& Clamps

Single Pressure Switch Detail

Yellow or black Plastic
Caps

Trap Connection
“Clamp ears”
Pointed OUT

AIR FLOW

Preassemble &
insert into furnace

Alternate Orienation

3/ ² ID
16
Rubber Tube

Dual Pressure Switch

EXHAUST

Relief Tube

3/ ² OD Flexible tubing
16
connector

Relief Tube Extension
AIR FLOW

Field
Supplied Tee
Tee Trap White PVC
(loose parts bag)

Coupling & Clamps
(Optional)

1/ ² ID Drain
2
Hose &
Clamps

Drain Tube Black, 5/8² ID Corrugated
Cut at straight section

Cap and Clamp
Open End
Leave room for clamp

Cut Here
25--24--47

Horizontal Left--Thru Top (See Figure 13)
Disconnect the hoses from the Trap assembly, and remove Trap
and Trap mounting bracket from the blower compartment. Using
cover plate and gasket provided in the loose parts bag, cover the
hole from the burner compartment to the blower compartment and
secure with screws.
Mount the Trap externally to the bottom side of the unit using the
2 screws provided in the location shown.
Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the Trap. Secure
connections with clamps.
Remove the black 1/2² ID Drain Tube from the Drain Tee. Install a
yellow cap and clamp over the open drain port of the Drain Tee.
1/

Connect the black 2² ID Drain Tube from the Vent Drain to the
Trap. Secure connections with clamps.
Connect the 3/16² ID relief tube to the middle port on the Trap. If an
extension is required, use the 3/16² OD flexible tubing connector

and the black 3/16² ID relief tube in the loose parts bag. Cut tube
to length. Secure all connections with clamps.
Cut an appropriate length of 2² PVC pipe, long enough to exit the
cabinet and connect the vent drain to either:
·

A standard field supplied 2² PVC tee (N9MP1 and 2 models), or

A 2² PVC coupling fastened onto the Drain Tee (*9MPD
models)

Figure 14

Horizontal Left--Side Vent
Single Pressure Switch Detail

Alternate Orienation

EXHAUST

Yellow or black
Plastic Cap

Field
Supplied Tee
Level or Sloped towards Tee
Vent Drain
& Clamps

Dual Pressure Switch
3/ ² ID Rubber Tube
16

Tee Trap White PVC
(loose parts bag)
On Some
Models ONLY

Drain Tube Black, 5/8² ID
Corrugated

Relief Tube
Drain Tube Black, 5/8² ID Corrugated
Cut at straight section

Leave room for clamp

1/ ² ID Drain Elbow
2
Drain Hose & Splice
Connector
(Cut- to- fit)

INLET

AIR FLOW

Splice Connector
Relief Tube Extension

Cut Here

WARNING
Move Caps to
top of trap
25--24--48

Horizontal Left--Side Vent (See Figure 14)
Remove the Drain Tee from the Vent Drain if installed (*9MPD models only)

and the black 3/16² ID relief tube in the loose parts bag. Cut tube
to length.

Rotate the inducer 180° for a side vent after loosening the 4 inducer
attachment screws. Reinstall and retighten the inducer screws to
20² pounds torque.
Disconnect the hoses from the Trap assembly, and remove Trap
and Trap mounting bracket from the blower compartment. Using
cover plate and gasket provided in the loose parts bag, cover the
hole from the burner compartment to the blower compartment and
secure with screws.

Cut an appropriate length of 2² PVC pipe, fittings and extension
pipe long enough to exit the cabinet and connect the vent drain to
either:
·
A standard field supplied 2² PVC tee (N9MP1 and 2 models), or
·
A 2² PVC coupling fastened onto the Drain Tee (*9MPD
models)
Install Tee Trap into bottom section of Tee.

Mount the Trap externally to the bottom side of the unit using the
2 screws provided in the location shown.

Important: The pipe to the Tee Trap must be level or sloping towards the Tee Trap

Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the Trap. Secure
connections with clamps.

Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 17.

Connect the black 2² ID Drain Tube from the Vent Drain to the
Trap. If an extension is required, use the black 1/2² OD flexible tubing connector and the black 1/2² ID Drain Tube in the loose parts
bag. Cut tube to length. Secure connections with clamps.
Connect the 3/16² ID relief tube to the middle port on the Trap. If an
extension is required, use the 3/16²OD flexible tubing connector
440 01 1020 02

Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both the external Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be
installed as shown for future servicing of the vent system.
A coupling and clamps (in loose part bag) may be installed as
shown for future servicing of the vent system.

Figure 15

Horizontal Right thru Top

Trap Connection

“Clamp ears”
Pointed OUT

Single Pressure Switch Detail
Alternate Orienation
Yellow or black
Plastic Cap

AIR FLOW

Coupling & Clamps
(Optional)
WARNING
Add Cap and
Clamp

3/ ² ID Rubber Tube
16

Vent Drain
& Clamps

EXHAUST

Preassemble &
insert into furnace

Field
Supplied Tee

Relief Tube
Splice Connector

Tee Trap
White PVC
(loose parts bag)

Relief Tube Extension

INLET
On Some Models
ONLY

Dual Pressure Switch
Drain Tube Black, 5/8² ID
Corrugated Cut at straight section

Leave room for clamp

1/ ² ID Drain Hose & barbed
2
coupling (Cut- to- fit)

Cut Here

25--24--49

Horizontal Right Thru Top (See Figure 15)
Disconnect the hoses from the Trap assembly, and remove Trap
and Trap mounting bracket from the blower compartment. Using
cover plate and gasket provided in the loose parts bag, cover the
hole from the burner compartment to the blower compartment and
secure with screws.
Mount the Trap externally to the bottom side of the unit using the
2 screws provided in the location shown.
Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the Trap. Secure
connections with clamps.
Connect the black 1/2² ID Drain Tube from the Vent Drain to the
Trap. If an extension is required, use the black 1/2² OD barbed
coupling and the black 1/2² ID Drain Tube in the loose parts bag.
Cut tube to length. Secure connections with clamps.
Connect the 3/16² ID relief tube to the middle port on the Trap. If
an extension is required, use the clear 3/16² OD flexible tubing con-

nector and the black 3/16² ID relief tube in the loose parts bag. Cut
tube to length.
Cut an appropriate length of 2² PVC pipe, fittings and extension
pipe long enough to exit the cabinet and connect the vent drain to
a standard field supplied 2² PVC tee
Install Tee Trap into bottom section of Tee.
Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 17.
Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both the external Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be
installed as shown for future servicing of the vent system.

440 01 1020 02

Figure 16

Horizontal Right--Side Vent

Single Pressure Switch Detail

Yellow or black
Plastic Cap

Coupling & Clamps
(Optional)

EXHAUST

AIR FLOW

Vent Drain
& Clamps

Field
Supplied Tee

Level or Sloped
towards Tee
Tee Trap
White PVC
(loose parts bag)

1/ ² ID Drain
2

3/ ² ID Rubber Tube
16

Elbow

Relief Tube

On Some Models
ONLY

Splice Connector

INLET

Relief Tube Extension

Alternate Orienation

Barbed coupling

Dual Pressure Switch
Drain Tube Black, 5/8² ID
Corrugated Cut at
straight section

Leave room for clamp

Drain Hose
(Cut- to- fit)

Cut Here

25--24--50

Horizontal Right Side Vent (See Figure 16)
Disconnect Drain Tee if installed (*9MPD models only)
Disconnect the hoses from the Trap assembly, and remove Trap
and Trap mounting bracket from the blower compartment. Using
cover plate and gasket provided in the loose parts bag, cover the
hole from the burner compartment to the blower compartment and
secure with screws.
Mount the Trap externally to the bottom side of the unit using the
2 screws provided in the location shown.
Cut the corrugated tube as shown in the illustration above. Connect the corrugated hose from the transition to the Trap. Secure
connections with clamps.
Connect the black 1/2² ID Drain Tube from the Vent Drain to the
Trap. If an extension is required, use the 1/2² OD barbed coupling
and the black 1/2² ID Drain Tube in the loose parts bag. Cut tube
to length. Secure connections with clamps.
Connect the 3/16² ID relief tube to the middle port on the Trap. If
an extension is required, use the clear 3/16²OD splice connector
and the black 3/16² ID relief tube in the loose parts bag. Cut tube
to length.

440 01 1020 02

Cut an appropriate length of 2² PVC pipe, fittings and extension
pipe long enough to exit the cabinet and connect the vent drain to
either:
·

A standard field supplied 2² PVC tee (N9MP1 and 2 models), or

A 2² PVC coupling fastened onto the Drain Tee (*9MPD
models)

Install Tee Trap into bottom section of Tee.
Important: The pipe to the Tee Trap must be level or sloping towards the Tee Trap
Connect the Tee trap and the main drain line exiting the casing as
shown in Figure 17.
Note: It is recommended that all PVC piping and fitting connections be fit up and inspected before final cementing. Both the external Trap and the external Tee Trap must be primed before
operation. Verify all condensate drain connections are securely
clamped. A coupling and clamps (in loose part bag) may be
installed as shown for future servicing of the vent system.

Connecting Tee Trap to Condensate Trap and Main Drain Line

Inlet

Exhaust

Figure 17

Open Tee
Tee Trap

Condensate
Trap

Evaporator Coil
Drain Line (Optional)

Main Drain Line

25--24--41N

The Tee Trap must be connected to the main condensate drain
line as conceptually shown above. Different installations may
require slightly different orientations. The following steps apply
to all installations.
9.

The Tee Trap should be installed as close to the side or top of
the furnace as practical. Minimize the distance between the
inducer and the Tee Trap as much as possible.

10. An open tee is to be used at the Tee Trap discharge. The top
end of the tee should be open to the atmosphere to eliminate
potential air lock problems.
11. The drain line from the Tee Trap is to be connected to the furnace condensate trap drain line as shown above.
12. Condensate drain lines from a cooling coil may be connected downstream of the connection point of the Tee Trap
and Furnace Condensate Trap.
Important: Prime both traps with water before operation.
Failure to prime the traps may result in discharge of flue gases
from the condensate drain line and open tee for a period of time,
and may result in temporary lockout of the furnace upon start
up. Main drain line construction is left to the discretion of the
installer. It may be made of either ridged pipe or flexible tube.
Tube ID should NOT be less than 1/2².

Connecting Vent and Combustion Air Piping
!
CARBON MONOXIDE POISONING HAZARD
Failure to properly seal vent piping can result in death,
personal injury and/or property damage.
Cement or mechanically seal all joints, fittings, etc. to
prevent leakage of flue gases.
Refer to Figure 8 through Figure 16 that corresponds to the installation position of the furnace for the application.
Preassemble the vent and combustion air piping from the furnace
to the vent termination. Do not cement the pipe joints until the pipe
preassembly process is complete.

Combustion Air Pipe Connection (Dual Certified or
Direct Vent)
Install the air intake coupling and gasket to the furnace with the
four(4) screws.
Note: The air intake coupling and gasket can be installed to the top
panel to the alternate air intake locations on either the left or right
side panels of the furnace.
For downflow installation, the air intake coupling and gasket must
be installed to the alternate air intake location on either the left or
right side panels. Remove the 3² hole plug from the side panel and
relocate to the air intake hole in the top panel. Use four screws to
seal the four(4) mounting holes in the top panel next to the hole
plug. Drill four(4) 7/64² diameter holes in the casing using the air intake coupling as the template.
440 01 1020 02

The air intake coupling is sized for 2² PVC pipe.
Install the combustion air pipe to the air intake coupling using RTV
sealant to provide for future serviceability.

Vent Pipe Connection
Install the vent pipe grommet to the furnace panel. Locate the
grommet in the furnace panel at a location directly away from the
vent fitting on the combustion blower. The grommet snaps into the
3² hole plug from the furnace panel. NOTE: Depending on the
installation position, the vent pipe grommet will be installed to the
top panel or to the alternate location on the side panels. If needed,
remove the 3² hole plug from the furnace panel and relocate to the
open hole in the furnace panel. (See Figure 8 or Figure 17)
Install the vent pipe to the rubber coupling, the vent fitting or the
PVC vent extension pipe. Securely attach using the clamp or PVC
cement as required.
Note: The vent fitting MUST be installed with the air flow marking arrow pointed toward the vent pipe. (See Figure 18)
Some installations require the vent fitting to be installed with
a 5°° to 10°° downward slope. (See Figure 8 thru Figure 17)

Proper Sealing Procedure for
Combustion Blower

Figure 18

Vent Pipe
(Top Panel Exit)

Rubber Coupling
& Clamps

NOTE: The 90° elbow is approved
for use inside the furnace ONLY.

Vent Pipe

90°° Elbow

Vent Fitting
& Clamps
Combustion
Blower

Vent Extension
Pipe (Side Panel
Exit)

SIDE VIEW
Rotate downward
5°° to 10°°

Tee

NOTE: Built--in channel will be angled 5° to 10° also.

NOTE: All PVC, CPVC, ABS, and Cellular Core pipe fittings, solvent cement, primers and procedures MUST conform to American
National Standard Institute and American Society for Testing and
Materials (ANSI/ASTM) standards.

Pipe and Fittings -- ASTM D1785, D2241, D2466, D2661,
D2665, F--891, F--628

·
·

PVC Primer and Solvent Cement -- ASTM D2564

Procedure for Cementing Joints -- Ref ASTM D2855
NOTE: In order to create a seal that allows future removal of pipe,
RTV sealant MUST be used on the inlet pipe where it joins to the
furnace. PVC, CPVC, ABS, and Cellular Core pipe and cement
may be used on all other joints.

Do NOT use solvent cement that has become curdled,
lumpy or thickened and do NOT thin. Observe
precautions printed on containers. For applications
below 32° F., use only low temperature type solvent
cement.
1.

Cut pipe end square, remove ragged edges and burrs.
Chamfer end of pipe, then clean fitting, socket and pipe joint
of all dirt, grease, or moisture.
NOTE: Stir the solvent cement frequently while using. Use a natural bristle brush or the dauber supplied with the cement. The proper
brush size is one inch.
2. After checking pipe and socket for proper fit, wipe socket
and pipe with cleaner-primer. Apply a liberal coat of primer to
inside surface of socket and outside of pipe. Do NOT allow
primer to dry before applying cement.
3. Apply a thin coat of cement evenly in the socket. Quickly apply a heavy coat of cement to the pipe end and insert pipe
into fittings with a slight twisting movement until it bottoms
out.
NOTE: Cement MUST be fluid while inserting pipe. If NOT, recoat
pipe.
4. Hold the pipe in the fitting for 30 seconds to prevent the tapered socket from pushing the pipe out of the fitting.
5. Wipe all excess cement from the joint with a rag. Allow 15
minutes before handling. Cure time varies according to fit,
temperature and humidity.

Connecting Vent Pipes and Termination

25--24--14a

NOTE: Combustion air intake and vent MUST terminate in the
same atmospheric pressure zone. If installation is in a cold climate
(sustained temperatures below 0°F), increase the minimum distance between vent pipe and air intake from 8² to 18².

Joining Pipe and Fittings
!
FIRE HAZARD
Failure to do so may cause personal injury and/or property
damage.
Observe all cautions and warnings printed on material
containers
Provide adequate ventilation and do NOT assemble near
heat source or open flame. Do NOT smoke while using
solvent cements and avoid contact with skin or eyes.
This furnace is approved for venting with Schedule 40 PVC, CPVC,
ABS, Cellular Core pipe fittings and SDR--26 PVC.

440 01 1020 02

CAUTION

Maintain a minimum of 36² between combustion air inlet
and clothes dryer vent. Terminate the combustion air
intake as far as possible from any air conditioner, heat
pump, swimming pool, swimming pool pumping,
chlorinator or filtration unit.

!
CARBON MONOXIDE POISONING HAZARD
Failure to properly vent this furnace can result in death,
personal injury and/or property damage.
1.

Install all couplings, nipples and elbows using proper procedures for Joining Pipe and Fittings and maintain spacing
between vent and combustion air piping as indicated in
Figure 19 through Figure 27 .

Figure 19

Sidewall Termination 12² or More
Above Snow Level or Grade Level
8” *
MIN.
20’
MAX

Vertical Termination
1.

*18²² Minimum for cold climates
(substained below 0°° F)

Figure 21 shows the proper installation and clearances for
vertical vent termination. The vertical roof termination
should be sealed with a plumbing roof boot or equivalent
flashing. The inlet of the intake pipe and end of the exhaust
vent must be terminated no less than 12² above the roof or
snow accumulation level, and 12² away from a vertical wall
or other protrusion.
If the vent system is installed in an existing chimney make
sure clearances shown in Figure 21 are maintained. Horizontal section before the termination elbow can be extended
on the inlet air to provide necessary clearance.

Rooftop Termination

Figure 21

Horizontal Termination
1.

3.
4.

Cut two holes. 21/2² for 2² pipe, 3² for 21/2² pipe, or 31/2² for
3² pipe. Do NOT make the holes oversized, or it will be necessary to add a sheet metal or plywood plate on the outside
with the correct size hole in it.

Check hole sizes by making sure it is smaller than the couplings or elbows that will be installed on the outside. The
couplings or elbows MUST prevent the pipe from being
pushed back through the wall.
Extend vent pipe and combustion air pipe through the wall
4² to 1² and seal area between pipe and wall.

Install the couplings, nipple and termination elbows as
shown and maintain spacing between vent and combustion
air piping as indicated in Figure 19 and Figure 20.

A metal shield is recommended 18² x 18² min. or 18² min. diameter
around the vent termination at the exterior wall to protect the house
exterior materials from flue product or condensation (freezing)
damage.

Using Exterior Risers
1.

Install elbows and pipe to form riser as shown in Figure 20.

Secure vent pipe to wall with galvanized strap or other rust
resistant material to restrain pipe from moving.

Insulate pipe with Armaflex or equivalent moisture resistant
closed cell foam insulation or Fiberglass insulation if boxed
in and sealed against moisture.

Figure 20

Sidewall Termination with Exterior
Risers to Get Above Snow Level or
Grade Level
8” *
MIN.
20’
MAX

*18²² Minimum for cold climates
(substained below 0°° F)

A = 12² Above roof or snow accumulation level
B = 8² Min., 20¢ Maximum, except in areas with extreme cold temperatures
(sustained below 0°F), the 18² Min.
25--00--06

Vent Termination Shielding
Under certain wind conditions some building materials may be affected by flue products expelled in close proximity to unprotected
surfaces. Sealing or shielding of the exposed surfaces with a corrosion resistant material (such as aluminum sheeting) may be required to prevent staining or deterioration. The protective material
should be attached and sealed (if necessary) to the building before
attaching the vent terminal.

Multi Vent Termination Clearances
When two (2) or more furnaces are vented near each other, each
furnace must be individually vented.
Two (2) vent terminations may be installed as shown in Figure 22,
Figure 23, Figure 24, Figure 25, Figure 26 and Figure 27, but
the next vent termination must be at least 36² away from first 2 terminations. It is important that vent terminations be made as shown
to avoid recirculation of flue gases.

Figure 22

Concentric Vent and Combustion-Air Roof Termination
“A”
Exhaust

12²² Min. Grade or
Snow Level

Combustion
Air

Dimension “A” is touching or 2² maximum separation.

440 01 1020 02

Concentric Vent and Combustion-Air Sidewall Termination

Figure 23

Rooftop Inlet Vent and Exhaust-Air Termination

Figure 26

18²² Min. for Cold Climates
(Sustained Below 0°° F)
Inlet

8²² Min.
20¢¢ Max.

1²² Maximum
(TYP.)

Combustion Air

Vent
12²² Min.
Grade or Snow
Level

“A”
Exhaust

Vent

Exhaust

25--22--02d

25--22--43

Dimension “A” is touching or 2² maximum separation.

Sidewall Inlet Vent and Exhaust-Air Termination

Figure 24

“A”
8²² Min.

Exhaust

Recommended Alternate
Installation for Sustained Cold
Weather (--0°° F & below)

Figure 27

“A”
Inlet
8²² Min.
20¢¢ Max.

EXHAUST

18²² Min. for
Cold Climates
(Sustained Below 0°° F)

12²² Min. Grade or
Snow Level

12²² MIN.

90°°

OVERHANG

INLET

Dimension “A” is touching or 2² maximum separation.

Figure 25

12²² MIN. Ground Level
OR Snow Level

Sidewall Inlet Vent and Exhaust--Air
Termination with Exterior Risers

18²² Min. for Cold Climates
(Sustained Below 0°° F)

8²² Min.
8²² Min.
20¢¢ Max.

Exhaust
Inlet

SIDE VIEW

FRONT VIEW

12²² Min.
Grade or Snow
Level

12²²

“A”

Same Joist
Space

25- 23- 73

Dimension “A” is touching or 2² maximum separation.

440 01 1020 02

5. Gas Supply and Piping
!

Table 6

CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD.

Gas
Type
T

Failure to follow these instructions can result in
death, personal injury and/or property damage.
Models designated for Natural Gas are to be used
with Natural Gas ONLY, unless properly converted to
use with LP gas.
NOTE: The rating plate is stamped with the model number, gas
type and gas input rating. In addition, models manufactured for
sale in Canada have orifice size information stamped on the rating
plate.

Gas Pressures Below 2000¢¢

Recommended

Max.

Min.

Manifold
Pressure
P

Natural

7²

14²

4.5²

3.5²

11²

14²

11²

10²

·
·
·
·

Supply Pressure

Important Note:
With Propane gas, the rated input is obtained when the
BTU content is 2,500 BTU per cubic foot and manifold
pressure set at 10²² W.C.
If Propane gas has a different BTU content, orifices
MUST be changed by licensed Propane installer.
Measured input can NOT exceed rated input.
Any major change in gas flow requires changing burner
orifice size.

Alternate BTUH Input Ratings (USA Only)

Gas Supply Pressure

The input rating of these furnaces can be changed from the standard input rating to the alternate input rating shown in Table 5, by
changing the main burner orifices. NOTE: The input rating ot
80,000 BTUH models cannot be changed from the standard input.
Changing of burner orifices MUST be done by a qualified service
technician. See section on changing orifices or following page.

Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures are usually set by gas suppliers.

Table 5

NOTE: Make adjustment to manifold pressure with burners operating.

Alternate Input Ratings, USA ONLY.

BTUH
Standard
Rating

BTUH
Alternate
Rating

Natural
Gas
Orifice

LP
Gas
Orifice

50,000

40,000

#44

#55

75,000

60,000

#44

#55

100,000

80,000

#44

#55

125,000

100,000

#44

#55

Supply Pressure
!
FIRE HAZARD
Failure to properly set input pressure can result in death,
personal injury and/or property damage.
Do NOT set input rating above that shown on rating plate.
1.

Supply pressure can be checked using the 1/8² NPT port on
the supply side of the gas valve.

Gas input to burners MUST NOT exceed the rated input
shown on rating plate.

Do NOT allow minimum gas supply pressure to vary downward. Doing so will decrease input to furnace. Refer to
Table 6 for normal gas supply and manifold pressures.

Manifold Gas Pressure Adjustment
!
ELECTRICAL SHOCK HAZARD.
Failure to do so can result in death, personal injury
and/or property damage.
Turn OFF power to furnace before changing speed
taps.
1.
2.

Remove the burner compartment door.
With gas OFF, connect manometer to tapped opening on
gas valve. Use manometer with a 0 to 15² water column
range.
3. Turn gas ON and remove adjustment screw cover on gas
valve. Turn counterclockwise to decrease pressure and
clockwise to increase.
4. For altitudes up to 2000¢, set pressure to value shown in
Table 6, ± 0.3² water column.
5. Connect manometer to the tapped opening on the outlet
side of gas valve. Use manometer with a 0--15² min. water
column range.
6. Turn gas ON, fire the furnace and remove adjustment screw
cover on gas valve.
7. Turn counterclockwise to decrease pressure and clockwise
to increase.
8. Set pressure to value shown in Table 6. Refer to Important
Notes in Table 6. Pressure is also listed on furnace rating
plate.
9. When pressure is set, replace adjustment screw cover on
gas valve.
10. Replace the burner compartment door.

440 01 1020 02

MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS
Table 7

NATURAL GAS
Elevation Above Sea Level

Heat Value
Btu/Cu.Ft.

0--1999
(²² ×wc)

2000--2999
(²² ×wc)

3000--3999
(²² ×wc)

4000--4999
(²² ×wc)

5000--5999
(²² ×wc)

6000--6999
(²² ×wc)

7000--7999
(²² ×wc)

800

3.5

850

3.5

900

3.5

3.4

950

3.5

3.3

3.2

3.1

1000

3.5

3.4

3.3

3.2

3.0

2.9

2.8

1050

3.2

3.1

3.0

2.9

2.7

2.6

2.5

1100

2.9

2.8

2.7

2.6

2.5

2.4

2.3

Orifice Size

* #42 Orifice size for 50,000, 75,000 100,00 & 125,000 BTUH models
* #44 Orifice size for 80,000 BTUH model

General Derating Rules
1.

Changing Orifices for High Altitude

For operation with natural gas at altitudes above 2,000¢, orifice change and/or manifold pressure adjustment may be required to suit gas supplied. Check with gas supplier. If orifice
sizing is needed, it should be based on reducing the input
rating by 2% (natural) or 4% (LP) for each 1,000¢ above sea
level. See Table 7 and Figure 28 for required pressure
change and/or orifice change for high altitudes.
For operation with LP gas at altitudes above 2,000¢, gas orifices MUST be changed and manifold pressure MUST be
maintained as per Table 6. For the 50,000, 75,000, 100,000
and 125,000 BTUH Orifice sizes are #54 for 0--2000¢ above
sea level, #55 for 2000¢ --7000¢ above sea level, and #56 for
7000¢ --8000¢ above sea level. For the 80,000 BTUH models,
the orifice size is #55 for 0 -- 4,000¢ above seal level and #56
for 5,000¢ -- 8,000¢ above sea level. Orifices can be ordered
through your distributor. (See Figure 28)

Figure 28

Changing Orifices
Measure from face of orifice
to the back side of the
manifold.

11/8² to 13/16²

!
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to properly install orifices can result in death,
personal injury and/or property damage.
Turn OFF electric power (at disconnect) and gas supply
(at manual valve in gas line) when installing orifices.
Installation of orifices requires a qualified service
technician.
NOTE: Main burner orifices can be changed for high altitudes.
1.

Disconnect gas line from gas valve.

Remove manifold from furnace.

Remove the orifices from the manifold and replace them
with properly sized orifices.

Tighten orifices so it is seated and gas tight. (See Figure 28)

Reinstall manifold. Ensure burners do NOT bind on new orifices.

Natural Gas Input Rating Check
NOTE: The gas meter can be used to measure input to furnace.
Rating is based on a natural gas BTU content of 1,000 BTU’s per
cubic meter. Check with gas supplier for actual BTU content.
1.

Make sure burner compartment door is in place before performing the following steps.

Turn OFF gas supply to all appliances and start furnace.

Example
NOTE: The derating of these units at 2% (Natural) and 4% (L.P.)
has been tested and approved by AGA.

High Altitude Air Pressure Switch
Altitudes over 4,000¢ require a different air pressure switch than the
one installed at the factory. Check parts list for pressure switch and
consult your distributor for part number and availability. In Canada,
provincial codes may govern installation of switch. Check with governing authorities.

440 01 1020 02

Natural Gas
BTU Content
1,000

No. of Seconds
Per Hour

Time Per Cubic
Foot in Seconds

BTU Per
Hour

3,600

75,000

1,000 x 3,600 ¸ 48 = 75,000 BTUH

Time how many seconds it takes the smallest dial on the gas
meter to make one complete revolution. Refer to Example.

Relight all appliances and ensure all pilots are operating.

NOTE: If meter uses a 2 cubic foot dial, divide results (seconds) by
two.

Figure 29

Typical Gas Piping for Upflow
Drip Leg and Union, Union* should be outside the
cabinet. Manual shut- off valve MUST be upstream of
dripleg, union, and furnace.
Manual shut- off
valve

Gas Pipe Grommet (Single Pipe)

Use elbows and 3²² pipe nipple to connect valve to
piping when using right side gas pipe entry.

LP Low pressure
switch. Optional
on some models.

3²² pipe
nipple

Models may
have 1 or 2
pressure
switches

* Union may be installed inside the cabinet when necessary
because of clearances.

Figure 30

25--23--37b

Typical Gas Piping for Downflow

Use elbows and 3²² pipe nipple to connect valve
to piping when using left side gas pipe entry.

LP Low pressure
switch. Optional LP
conversion.

Manual shut- off
valve

Drip Leg and Union, Union* should be outside
the cabinet. Manual shut--off valve MUST be
upstream of dripleg, union, and furnace.
Gas Pipe Grommet
(Single Pipe)
*Union may be installed inside the cabinet when necessary
because of clearances.

Gas Piping Requirements
NOTE: The gas supply line must be installed by a qualified service
technician in accordance with all building codes, (In the state of
Massachusetts, gas supply connections MUST be performed by a
licensed plumber or gas fitter).
1.

Properly size gas pipe to handle combined appliance load or
run gas pipe directly from gas meter or LP gas regulator. Refer to NFGC and ANSI Z223.1 for proper gas pipe size.

Install correct pipe size for run length and furnace rating.

Models may have
1 or 2 pressure
switches

25--23--39

Measure pipe length from gas meter or LP second stage
regulator.

NOTE: Refer to Figure 29 or Figure 30 for the general layout at
the furnace. The rules listed apply to natural and LP gas pipe installations.
NOTE: On the Dual Certified or Direct Vent models, install the gas
pipe grommet to the furnace side panel with the gas pipe entry. If
needed, remove the 2² hole plug and relocate to the open hole in
the furnace side panel.
440 01 1020 02

!
If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at
gas valve and extended a minimum of 2²² outside furnace
casing.
4.

Use black iron or steel pipe and fittings or other pipe approved by local code.

NOTE: The use of copper tubing for gas piping is NOT approved by
the state of Massachusetts.
5.

Use ground joint unions and install a drip leg no less than 3²
long to trap dirt and moisture before it can enter gas valve.

Use two pipe wrenches when making connections to prevent gas valve from turning.

Install a manual shut--off valve external to furnace casing
and tighten all joints securely.

Additional LP Connection Requirements
1.

Have a licensed LP gas dealer make all connections at storage tank and check all connections from tank to furnace.

If copper tubing is used, it MUST comply with limitation set in
National Fuel Gas Code or CGA codes.

Two--stage regulation of LP gas is recommended.

Final Check
1. The furnace and the gas valve must be disconnected from the
gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/2² PSIG. Close the
manual shut--off valve before testing at such pressures.
2. When installation is complete, test all pipe connections for
leaks with the gas pressure less than 1/2² PSIG to the gas
valve.
3.

Apply a commercial soap solution to all joints to test for
leaks. Correct any leaks indicated by bubbles.

Correct even the smallest leak at once.

Check for leaks at gas valve and orifice connections to the
burner manifold along with the pilot tube connections to the
valve and pilot assembly while the furnace is operating.

6. Electrical Wiring
!
Electrical shock hazard.
Failure to do so can result in death, personal injury
and/or property damage.
Turn OFF electrical power at fuse box or service
panel before making any electrical connections
and ensure a proper ground connection is made
before connecting line voltage.

Power Supply Wiring
The furnace MUST be electrically wired and grounded in accordance with local codes, or in the absence of local codes with the
latest edition of The National Electric Code, ANSI NFPA 70 and/or
The Canadian Electric Code CSA C22.1.
The power supply to the furnace connections must be between 104
VAC and 127 VAC during furnace operation for acceptable performance.
Field wiring connections must be made inside the furnace connection box. A suitable strain relief should be used at the point the
wires exit the furnace casing.
Copper conductors must be used. Line voltage wires should be
sized for the input amps stated on the rating plate. Furnace should
be connected to its own separate circuit.

Thermostat
Thermostat location has an important effect on the operation of the
unit. Follow instructions included with thermostat for correct
mounting and wiring.

Optional Equipment
All wiring from furnace to optional equipment MUST conform to local codes or, in the absence of local codes with the latest edition of
The National Electric Code, ANSI NFPA 70 and/or The Canadian
Electric Code CSA C22.1. Install wiring in accordance with
manufacturer’s instructions. The wiring MUST have a minimum
temperature rating of 105° C.

Humidifier/Electronic Air Cleaner
The furnace is wired for humidifier and/or electronic air cleaner
connection.

CAUTION
Do NOT exceed 115V/0.8 amp. maximum current load for both
the EAC terminal and the HUM terminal combined.
NOTE: The humidifier will be powered when the furnace is fired
and the circulating air blower comes on. The electronic air cleaner
will be powered anytime the air circulating blower is energized.
However, the electronic air cleaner is NOT energized during continuous fan operation controlled by the electronic fan control.

Fan Control
The fan control is preset at the factory with a fixed blower ON delay
of 30 seconds in the heating mode. The blower OFF timing is preset at 140 seconds. If desired, the fan OFF delay can be reset to
obtain the longest delay times while still maintaining comfort levels.
See “Furnace Wiring Diagram” .

Fan Delay DIP Switch Settings
COOL ON DELAY: 5 SEC.
COOL OFF DELAY: 90 SEC.
HEAT ON DELAY: 30 SEC.

Low voltage connections to furnace must be made on terminal
board to fan control.
Set thermostat heat anticipator in accordance with the Technical
Support Manual.

440 01 1020 02

25--23--47

Figure 31

Control Center Fuse

Electrical Connections

The 24V circuit contains a 5--amp, automotive--type fuse located
on fan timer board. (See Figure 32) Any electrical shorts of 24V
wiring during installation, service, or maintenance may cause fuse
to blow. If fuse replacement is required, use only a fuse of identical
size (5 amp.)

NOTE: Junction Box can be
mounted to either the left or right
side.

HOT
NEUT.

115V. 60 Hz
W
BK

Figure 32

Fan Timer Connections

Connection
Box
Ground

Low Voltage
Terminal Board

R
G
W
Y
G

W
R

Models may
have 1 or 2 pressure
switches

NOTE: 115 VAC/60Hz/single--phase
Operating voltage range*: 127 max, 104 min.

DIP Switch

FUSE
25--23--41

25--23--42

* Permissible limits of voltage at which unit will operate satisfactorily

7. Ductwork and Filter
4.

!
CARBON MONOXIDE POISONING HAZARD.
Failure to properly seal duct can result in death
and/or personal injury.
Do NOT draw return air from inside a closet or utility
room where furnace is located. Return air duct
MUST be sealed to furnace casing.

Installation
NOTE: Design and install air distribution system to comply with Air
Conditioning Contractors of America manuals and/or NFPA pamphlets 90A and 90B or other approved methods that conform to local codes and good trade practices.
1.

When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct outside furnace space .

Install air conditioning cooling coil (evaporator) on outlet
side of furnace.

For furnaces installed without a cooling coil it is recommended that the outlet duct be provided with a removable
access panel. This panel should be accessible when the furnace is installed so the exterior of the heat exchanger can be
viewed for inspections. The access panel MUST be sealed
to prevent leaks.

If separate evaporator and blower units are used, install
good sealing dampers for air flow control. Chilled air going
through the furnace could cause condensation and shorten
the furnace life.

NOTE: Dampers (field supplied) can be either automatic or manual. Manually operated dampers MUST be equipped with a means
to prevent furnace or air conditioning operation unless damper is in
the full heat or cool position.

!
CARBON MONOXIDE POISONING HAZARD
This could result in death, personal injury and/or property
damage.
Cool air passing over heat exchanger can cause
condensate to form resulting in heat exchanger failure.

Connections
NOTE: On upflow installations, return air can enter through either
side, both sides, or the bottom. On horizontal or downflow installations the return air must enter through the knockout opening in the
lower panel of the furnace. Return air can not enter through rear of
the furnace. When the furnace is located in an area near or adjacent to the living area, the system should be carefully designed
with returns to minimize noise transmission through the return
grille. Any blower moving a high volume of air will produce audible
noise which could be objectionable to when the unit is located very
close to living areas. It is advisable to route the return air ducts under the floor or through the attic.

440 01 1020 02

For side connections using a 16² x 25² filter, cut out the embossed area shown in Figure 33. This will provide a 141/2² x
221/2² approximate opening.

Figure 33

Figure 34

Side Mounted Filter Rack

Side Return Air Cutout

A = 141/2² Height of Cutout for 16² x 25² Filter
B = 221/2² Width of Cutout for 16² x 25² Filter
B

25--20--90

Embossed Area
on Side of Furnace

Filter Installation using Optional Filter Rack

A
Furnace
Bottom

NOTE: Furnaces with 5 TONS cooling rating require two(2) side
returns or one side return with bottom return.
2.

Bottom returns can be made by removing the knockout panel in the furnace base. Do NOT remove knock-out except for
a bottom return.

Installation of locking-type dampers are recommended in all
branches, or in individual ducts to balance system’s air flow.

Non-combustible, flexible duct connectors are recommended for return and supply connections to furnace.

If air return grille is located close to the fan inlet, install at
least one, 90° air turn between fan and inlet grille to reduce
noise.

When installing or removing a bottom mounted filter, slide the two
side filter clips to the back of the furnace BEFORE installing or removing. This will allow the filter to clear the front raised edge of the
furnace. Insert filter into side clips first and push filter back until it is
fully engaged into back clip. When filter is in place, slide clips back
into place midway on filter as shown in Figure 35.

Figure 35

Bottom Mounted Filter Rack

NOTE: To further reduce noise, install acoustical air turning vanes
and/or line the inside of duct with acoustical material.

Sizing
Existing or new ductwork MUST be sized to handle the correct
amount of airflow for either heating only or heating and air conditioning.

Insulation
1.

Insulate ductwork installed in attics or other areas exposed
to outside temperatures with a minimum of 2² insulation and
vapor barrier.

Insulate ductwork in indoor unconditioned areas with a minimum of 1² insulation with indoor type vapor barrier.

Filters
A Filter must be used:

25--24--18
Slide filter clips towards back before removing

Refer to Figure 36 and for guidelines to install filters. Furnaces
which require larger filter media and have limited clearances on
one side of furnace, require a standoff filter rack, see Figure 36,
available from your distributor.

Figure 36

Standoff Filter Rack

Using Optional
Standoff Filter
Rack

Filters are not supplied with these furnaces, but can be purchased
from dealer.
Use either filter type:
· Washable, high velocity filters are based on a maximum
air flow rating of 600 FPM.

· Disposable, low velocity filters are based on a maximum
air flow of 300 FPM when used with filter grille.

NOTE: Disposable, low velocity filters may be replaced with washable, high velocity filter providing they meet the minimum size
areas. Washable, high velocity filters can be replaced ONLY with
same type and size.

440 01 1020 02

25--21--45a

Combustible Floor Installation

CAUTION
If filters are only suitable for heating application, advise
homeowner that filter size may need to be increased if air
conditioning is added.

FIRE HAZARD

Addition Of Air Conditioning

Failure to install unit on noncombustible subbase can
result in death, personal injury and/or property damage.

When a refrigeration coil is used in conjunction with this unit, it must
be installed on the discharge side of the unit to avoid condensation
on the heat exchanger. The coil installation instructions must be
consulted for proper coil location and installation procedures. With
a parallel flow arrangement, dampers must be installed to prevent
chilled air from entering the furnace. If manually operated dampers
are used, they must be equipped with a means to prevent operation
of either unit unless the damper is in full heat or full cool position.
A 3² clearance is required on the right side of the furnace in order to
run the condensate drain line. Copper, iron or plastic tubing may be
used for the condensate drain line.

Downflow Furnace Installation
Non- Combustible Floor Installation
Fabricate a plenum to the dimensions given in Table 8, for the furnace outlet. Plenum should be flanged, approximately 3/4² for support.
Note: The three(3) screws in the top panel of the furnace next to the
duct flange MUST be removed to provide serviceability of the primary heat exchangers in the downflow installation
1.

Position plenum through the floor and set the furnace over
the opening in the floor. If necessary, grout around the base
to seal air leaks between the base and the floor.
Table 8

Place furnace on noncombustible subbase on downflow
applications, unless installing on non--combustible
flooring.

Subbase for Combustible Floor
NOTE: The three(3) screws in the top panel of the furnace next to
the duct flange MUST be removed to provide serviceability of the
primary heat exchangers in the downflow installation
Note: When using the subbase for combustible floors, the discharge air duct flanges on the furnace MUST be broken down to
provide proper fit up to the subbase. Use duct pliers to bend the
duct flanges flat onto the furnace casing. DO NOT bend the duct
flanges inward (toward the heat exchangers) as air flow restrictions
may occur.
The Subbase for Combustible Floors MUST be used when a downflow furnace is set on a combustible floor, even when the furnace is
installed on a coil box.
1.

Cut the opening in the floor according to Table 8. The hole in
the floor must be cut to the dimensions listed in Table 8
since the base is equipped with locating tabs that center the
base over the opening.

The opening in the base is 11/4² shorter and 11/8² narrower than the
recommended size of the opening in the floor. This is done to maintain clearance between the floor and the plenum.
2.

Fabricate the plenum to the dimensions given in Table 8.
Note that the dimensions given are outside dimensions.

Subbases for Combustible Floors Dimensions

Subbase for Combustible
Floors Part Number

Subbase for Combustible
Floor Dimensions

Opening In Floor

Opening In Base
For Plenum

Typical Plenum
Dimensions

K**

1511/16

283/4

149/16

161/4

145/8

131/2

195/

283/

183/

161/

181/

171/

171/8

161/4

217/8

193/4

161/

235/

221/

221/2

131/2

171/

171/8

193/

193/4

235/8

221/2

Furnace Subbase

NAHH001SB
NAHH002SB
NAHH003SB
NAHH010SB

225/16

283/4

2113/16

243/

283/

239/

Subbase for Coil Cabinets

NAHH004SB
NAHH005SB
NAHH006SB
NAHH009SB
*
**

1511/16

209/16

149/16

161/4

145/8

195/

209/

183/

161/

181/

161/

217/

23
2411/16

209/

16
16

209/16

16
2113/16
239/16

161/
16

161/4

Outside Dimension
Base Spacer Side To Side

Set the base over the opening in the floor, centering it over
the opening. Fasten the base to the floor with screws or
nails. See Figure 37, Figure 38 and Figure 39.

Drop the plenum through the opening in the base. The
flange of the plenum should rest on top of the subbase.

440 01 1020 02

Position furnace or coil cabinet and furnace on subbase so it
aligns between the locating tabs.

Figure 37

Figure 39

Furnace Subbase

Furnace
Installation of
Combustible
Floor Base

Plenum

J
K

2”

Wood Floor

P
L

1”

Combustible
Floor Base
M

Setting the Subbase

Hole
in
Floor

Plenum

Wood Screw

25--20--46a

This subbase for combustible floors has been designed so that the
height of the subbase raises the downflow coil off the floor to allow
easy installation of the condensate drain. See Figure 40.

Figure 40

Condensate Line Raised by Base

25--20--46
A = 4 1/4” Minimum clearance from back of hole to wall or other obstruction.

Figure 38

Coil Cabinet Subbase
S

Plenum
25--20--52

J
K

2”

P
L

1”

N
A

2”

Hole
in
Floor
25--20--46b

A = 4 1/4” Minimum clearance from back of hole to wall or other obstruction.

8. Checks and Adjustments
Startup

Manifold Gas Pressure Adjustment

NOTE: Refer to the start--up procedures in the “User’s Information
Manual” or to the “Operating Instructions Label” on the furnace.

NOTE: Make adjustment to manifold pressure with burners operating.

CAUTION

If any sparks, odors or unusual noises occur,
immediately shut OFF power to furnace. Check for
wiring errors or obstruction to blower.
Failure to correct hazard could result in death,
personal injury, and/or property damage.

Gas Supply Pressure
Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures are usually set by gas suppliers.
440 01 1020 02

!
Fire or explosion hazard.
Failure to turn OFF gas at shut off before connecting
manometer can result in death and/or personal
injury.
Turn OFF gas at shut off before connecting
manometer.
1.
2.

Remove the burner compartment door.
With gas OFF, connect manometer to tapped opening on
gas valve. Use manometer with a 0 to 15² water column
range.

Turn gas ON and remove adjustment screw cover on gas
valve. Turn counterclockwise to decrease pressure and
clockwise to increase.

For altitudes up to 2000¢, set pressure to value shown in
Table 6, ± 0.3² (8mm) water column. For altitudes of 2000¢ to
8000¢, see Section 5 for correct pressure setting.

Adjust Pilot Burner

Changing Blower Speed
!

Pilot Burner

ELECTRICAL SHOCK HAZARD

Proper Flame
Adjustment

Flame Sensor

3/ ² to 1/ ²
8
2

Failure to do so can result in death and/or personal
injury.
Turn OFF power to furnace before changing speed taps.

Hot Surface
Igniter

10--11--65

Main Burner Flame Check
Allow the furnace to run approximately 10 minutes then inspect the
main burner and pilot flames. See Figure 42.
Check for the following (Figure 42):
· Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames MUST NOT have solid, yellow
tips.
· Flames extending directly from burner into heat exchanger.
· Flames do NOT touch sides of heat exchanger.
If any problems with main burner flames are noted, it may be necessary to adjust gas pressures, or check for drafts.

Figure 42

3.
4.

The furnace has a pilot flame to light the main burner. The flame
should surround 3/8² to 1/2² of the flame sensor. See Figure 41. To
adjust, remove cap from pilot adjusting screw on gas valve. Turn
screw counterclockwise to increase or clockwise to decrease
flame as required. Replace adjusting screw cap.

Figure 41

Main Burner

NOTE: The speed taps that the manufacturer sets from the factory
for this product are based on a nominal 400 CFM per ton cooling
and the basic mid range on the temperature rise for heating.
Since the manufacturer cannot establish the static pressure
that will be applied to the unit, it is the responsibility of the installer dealer/contractor to select the proper speed taps for the
application when the unit is installed.

CAUTION

!
Failure to properly set the air temperature rise could
result in reduced furnace life.
Use ONLY the following blower motor speed taps for setting air
temperature rise.
Blower Motor Speed Taps
Hi (BLK)
Med--Hi (O)
Med Lo (BL
Lo (RED)

Table 9

10--10--78

Temperature Rise Check
The blower speed MUST be set to give the correct air temperature
rise through the furnace as marked on the rating plate. Temperature rise is the difference between supply and return air temperatures.
To check temperature rise,use the following procedure:

Model Sizes
All
All except 050F/J14
All except 075B/F12
and 100F/J14
050B/F12, 100J20,
and 125J/L20

If it is necessary to change speeds, refer to steps below.
1. Refer to Furnace Wiring Diagram for location of the heating
and cooling speed taps located on the electronic fan control
as well as location of unused blower motor speed leads. Use
the chart (Table 9) to determine the blower motor speed settings.

Burner Face

Place thermometers in supply and return air registers as
close to furnace as possible, avoiding direct radiant heat
from heat exchangers.
Operate furnace continuously for 15 minutes with all registers and duct dampers open.
Take reading and compare with range specified on rating
plate.
If the correct amount of temperature rise is NOT obtained, it
may be necessary to change blower speed. A higher blower
speed will lower the temperature rise. A lower blower speed
will increase the temperature rise.

Blower Speed Chart

Wire Color
Motor Speed
Black
High
Orange*
Med--High
Blue
Medium
Red
Low
* Med--High speed may not be provided on all models.
2.

Change the heat or cool blower motor speed by removing
the motor lead from the “Heat” or “Cool” terminal and replace it with the desired motor speed lead from the “Unused
Motor Lead” location. Connect the wire previously removed
from the “Heat” or “Cool” terminal to the vacated “Unused
Motor Lead” terminal.
440 01 1020 02

If the same speed must be used for both heating and cooling, remove the undesired motor speed lead from the “Heat”
or “Cool” terminal and connect that lead to the open terminal at “Unused Motor Lead” location. Attach a jumper between the “Heat” and “Cool” terminals and the remaining
motor speed lead.
Note: For motors with (4) speed leads, it will be necessary to
tape off the terminal of the motor speed lead removed from
the “Heat” or “Cool” terminal with electrical tape since an
open terminal will not be available at the “Unused Motor
Lead” location.

Continuous Fan Operation
A terminal is provided on the electronic fan control located in the
circulating blower compartment for operation of the continuous fan
option. This connection is intended for the low speed motor tap,
and has a lower contact rating (8 amps) than the heat and cool
taps. When the low speed blower lead is connected to this terminal,
this will provide low speed blower operation whenever the other
two speeds (Heat or Cool) are not energized.
Thoroughly check the system after modification to ensure the proper operation of the circulating air blower in all modes of operation.

Separate speed selections for Heat, Cool, and
Continuous Fan
Connect low speed lead from circulating motor to the “Cont.” terminal at the electronic fan control. The appropriate motor leads
should already be connected to the “Heat” and “Cool” terminals.

Heating and Continuous Blower Speed the
Same
If it is necessary to operate the heating speed and continuous
blower speed using the same blower speed, connect a jumper between the ”Heat” and ”Cont.” terminals on the electronic fan control.
Note: There should be only ONE motor lead going to the “Heat”
and “Cont.” terminals.

9. Furnace Maintenance
CAUTION

See “User’s Information Manual” and the “Service Manual”.

It is recommended that the furnace be inspected and serviced
on an annual basis (before the heating season) by a qualified
service technician.

10. Sequence of Operation & Diagnostics
The following is the normal operating sequence for the control system.

Cooling (Y) Request:

24 VAC signals applied to Y & G terminals of EFT (electronic fan timer) control.
· Cool motor speed energized after 5 second Cool Fan On Delay time.
Y & G signals removed from EFT.

· Cool motor speed de--energized after 90 second Cool Fan Off Delay time.

Circulating Fan (G) Request:
24 VAC signals applied to G terminals of EFT control.

· Heat motor speed energized without delay.
G signal removed from EFT.
· Heat motor speed de--energized without delay.

Heating (W) Request:
24 VAC signals applied to W terminal of EFT control.
· Inducer motor turns on.
· The gas valve solenoid energizes.
· Following a 3 second prepurge delay, the pilot valve opens and the ignitor begins to warm up.
· After the pilot lights, the main burners energize and light.
· Timed from the opening of the main gas valve, the control will delay 30 seconds before switching the fan to Heat speed.
W signal removed from EFT.

· The gas valve de--energizes and the main burners go out.
· The inducer runs at its present speed for a 30 second postpurge period.
· Timed from the gas valve de--energizing, the Heat fan speed de--energizes after the selected Heat Fan Delay time expires.

Heating Request with Gas Supply Line Shut Off:
24 VAC signals applied to W terminal of EFT control.
· Inducer motor turns on.
· The gas valve solenoid energizes.
440 01 1020 02

·
·
·
·
·
·
·
·

Following a 3 second prepurge delay, the pilot valve opens and the ignitor begins to warm up.
The ignitor glows red--hot for 30 seconds, then turns off.
The igniter stays off for 25 seconds, then begins to warm--up again.
The igniter glows red--hot for 30 seconds, then turns off.
The pilot valve closes 3 seconds after the igniter de--energizes.
The inducer de--energizes 5 seconds after the pilot valve closes.
The SmartValve proceeds to soft lockout and flashes error code 6.
The control exits soft lockout after 5 minutes and begins
another ignition sequence.

Gas Valve Diagnostic Codes (See Figure 43)
OFF
= Control not powered
Heartbeat
= Normal Operation (Standby or call for heat)
1 Flash
= Not used
2 Flashes
= Pressure switch closed when should be open
3 Flashes
= Pressure switch circuit was still sensed as open 30 seconds after the inducer was energized. System is
in 5 minute delay mode, with inducer off. After 5--minute delay, a new ignition sequence will be initiated.
(Note: SV9541M On/Off switch in off position during a call for heat will generate this diagnostic code)
4 Flashes
= Limit switch string open
5 Flashes
= Flame sensed out of sequence -- Flame signal still present.
6 Flashes + 1 Note 1
= Soft Lockout --Maximum retry count exceeded (failed to light within 4 trials for ignition)
6 Flashes + 2 Notes 1,2 = Soft Lockout --Maximum recycle count exceeded -- Last failure was Flame Sense Lost During Run
6 Flashes + 3 Notes 1,2 = Soft Lockout --Maximum recycle count exceeded -- Last failure was Airflow Proving Circuit Opened
During Run
6 Flashes + 4 Notes 1,2 = Soft Lockout --Maximum recycle count exceeded -- Last failure was Limit Circuit Opened During Run
7 Flashes
= Soft Lockout Due to Limit Trips Taking Longer than 2 minutes to Reset; Auto Reset After 1 Hour if
Call for Heat Still Present. Reset by Cycling Call for Heat at Any Time.
NOTE 1: The 6 + X designation indicates a combination of flash codes: 6 flashes shows the control is in soft lockout, followed by X flashes
to indicate the reason the control went into soft lockout. When the 6+ X code is flashing, the SV9541 will attempt a new ignition sequence
after a five minute delay period, if the call for heat is still present. Reset of the thermostat will initiate a new ignition sequence immediately.
NOTE 2: Any combination of 5 ‘abnormal’ events during a single call for heat will result in soft lockout. An ‘abnormal’ event is a Flame
Sense Failure During Run, Airflow Proving Circuit Open During Run, or Limit Circuit Open During Run. The flash code will indicate which
was the last ‘abnormal’ event that put the system into the soft lockout state based on the table above.

Figure 43

Typical Gas Valve Honeywell
OUTLET

Pilot Pressure
Adjustment (Hidden)
On\Off
Switch

INLET

Manifold Pressure
Adjustment
Diagnostic Light

dwg 25--23--31a

440 01 1020 02

HONEYWELL SV9541M “SMART VALVE” Sequence of Operation
POWER APPLIED TO APPLIANCE

THERMOSTAT CALLS FOR HEAT

PRESSURE SWITCHES PROVED OPEN?

WAIT FOR PRESSURE SWITCHES TO OPEN

COMBUSTION BLOWER ENERGIZED

PRESSURE SWITCHES CLOSED WITHIN 30 SECONDS?

FIVE MINUTE WAIT PERIOD

COMBUSTION BLOWER DE- ENERGIZED

3 SECOND PRE- PURGE

PILOT VALVE OPENS:
IGNITOR POWERED (1)

THREE SECOND FLAME
FAILURE RECYCLE DELAY

PILOT LIGHTS AND FLAME IS SENSED
DURING 90 SECOND TRAIL FOR
IGNITION?

PILOT VALVE CLOSES;
PILOT IGNITOR OFF

YES
MAIN VALVE OPENS,
HEATING FAN “ON” DELAY BEGINS

AFTER DELAY: CIRCULATING BLOWER STARTS

YES
FLAME SENSE LOST?

PILOT AND MAIN VALVE CLOSE

THERMOSTAT CALL FOR HEAT ENDS

FLAME SENSE LOST MORE THAN FIVE
TIMES IN THIS CALL FOR HEAT?

CIRCULATING BLOWER OFF AFTER DELAY

NO
NO
PILOT AND MAIN VALVE CLOSE

COMBUSTION BLOWER DE- ENERGIZED AFTER 30
SECOND POST PURGE

COMBUSTION AIR BLOWER OFF AFTER POST
PURGE

YES

(1) Ignitor “ON” for first 30 seconds of trial for ignition, then “OFF” for next 30 seconds. If the pilot has
not lit, it turns back “ON” for the final 30 seconds. The pilot valve remains energized during the entire
90 second trial for ignition.
NOTE: If main limit string opens and takes longer than 2 minutes to close, system goes into 1 hour wait
period.

CIRCULATING BLOWER OFF AFTER DELAY

WAIT FOR NEXT CALL FOR HEAT

440 01 1020 02

HONEYWELL SV9541M “SMART VALVE” Trouble shooting
The 6 + X designation indicates a combination of flash codes: 6 flashes shows the control is in soft lockout, followed by X flashes to indicate
the reason the control went into soft lockout. Last status code indicates repair to address first

LED
STATUS

INDICATES

CHECK/REPAIR

Off

No power to system control.

Line voltage input at L1 and Neutral connectors on ST9160B Fan Timer.
Low voltage (24V) power at 24 VAC and COM terminals on ST9160B
System wiring harness is in good condition and securely connected.

Heartbeat
Bright – Dim

Normal indication whenever the system is powered, unless some
Not Applicable
abnormal event has occurred.

2 Flashes

Pressure switches closed when it should be open
Pressure switches stuck closed (system will wait for pressure switch to
(i.e. when call for heat begins).
open).
(Combustion blower is not energized until pressure switches
Pressure switches miswired or jumpered.
opens)

-- Normal Operation (stand by or call for heat)

Pressure switches , open when they should be closed (i.e. longer
than 30 seconds after combustion blower/inducer is energized). Ignition system control switch must be in the ON position.
3 Flashes

Pressure switches operation, tubing, and wiring.
System goes into 5--minute delay period, with combustion blower/ Restrictions in furnace air intake or vent piping.
inducer off. At end of the 5--minute delay, another cycle will begin.
Main Limit or Roll Out Switch is open.

Main limit switch.
Manual reset burner rollout switch.

4 Flashes

Combustion blower is energized, Circulating blower is energized Limit and rollout switch wiring is in good condition and securely
connected.
heat speed.
Flame signal sensed out of proper sequence.

5 Flashes

Flame at pilot burner.

Combustion blower is energized, Circulating blower is energized
heat speed after the “ON” delay.
Soft Lockout.
Failed to light pilot during 90 sec. trial for ignition

6 Flashes

1 Flash

Gas supply off or pressure too low or high for appliance to operate.
Damaged or broken HIS element

Line voltage HOT lead wire not connected to L1 terminal on ST9160B.
Furnace not properly earth grounded.
Combustion air blower is de--energized, Circulating blower is de-Flame sense rod contaminated or in incorrect position.
energized after the “OFF” delay.
Pilot burner located in incorrect position.
Pilot burner lead wires are in good condition and popery connected.
After 5--minute delay time, control system will reset and initiate a
Pressure switches operation, tubing, and wiring.
new ignition sequence,
Soft Lockout.
Gas supply off or pressure too low or high for appliance to operate.
Last failure was Flame Sense lost during run.

6 Flashes
2 Flashes

Line voltage HOT lead wire not connected to L1 terminal on ST9160B.

Furnace not properly earth grounded.
Flame sense rod contaminated or in incorrect position.
Pilot burner located in incorrect position.
Combustion air blower is de--energized, Circulating blower is Pilot burner lead wires are in good condition and properly connected.
Cycling, pressure switch
de--energized after the “OFF” delay.
Condensate drain blocked
After 5--minute delay time, control system will reset and initiate a Pressure switches operation, tubing, and wiring.
new ignition sequence,
Maximum recycle count exceeded

440 01 1020 02

HONEYWELL SV9541M “SMART VALVE” Trouble shooting continued
LED
STATUS

INDICATES

CHECK/REPAIR

Soft Lockout.
Last failure was pressure switch
6 Flashes

3 Flashes

Maximum recycle count exceeded

Ignition system control switch must be in the ON position.
Pressure switches operation, tubing, and wiring.

Restrictions in furnace air intake or vent piping.
Combustion air blower is de--energized, Circulating blower is de-High winds blowing against vent.
energized after the “OFF” delay.
After 5--minute delay time, control system will reset and initiate a
new ignition sequence,
Soft Lockout.
Last failure was limit circuit opened during run.

6 Flashes

4 Flashes

Combustion air blower is de--energized, Circulating blower is
de--energized after the “OFF” delay.

Main limit switch.
Limit and rollout switch wiring is in good condition and securely
connected.
Restriction in duct work.
Dirty filter

After 5--minute delay time, control system will reset and initiate a
new ignition sequence,
Soft Lockout.
Blower failure (typical)
7 Flashes

Limit trip took longer than 2 minutes to reset.

Dead blower.
Blocked duct work.

System will start a new ignition sequence after 1 hour, if call for
heat still present.

11. Concentric Termination
Vent Termination Clearances
!
CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD
Failure to properly vent this furnace can result in
death, personal injury and/or property damage.
Inlet and outlet pipes may NOT be vented directly
above each other (standard vent terminals).
1.

Determine termination locations based on clearances specified in following steps and as shown in Figure 7,
Figure 44 through Figure 49.

The vent termination must be located at least 12² above
ground or normally expected snow accumulation levels.

Do NOT terminate over public walkways. Avoid areas where
condensate may cause problems such as above planters,
patios, or adjacent to windows where steam may cause fogging.

440 01 1020 02

The vent termination shall be located at least 4¢ horizontally
from any electric meter, gas meter, gas regulator, and any
relief equipment. These distances apply ONLY to U.S.
installations.

In Canada, the Canadian Fuel Gas Code takes precedence
over the preceding termination instructions.

Concentric Vent Termination - Kit #
NAHA001CV & NAHA002CV
These kits are for vertical or horizontal termination of the combustion air inlet and the exhaust vent pipes on Category IV gas--fired
condensing furnaces. The NAHA001CV kit can be used for 3² diameter pipe systems. The NAHA002CV kit can be used for 2² diameter pipe system. Refer to Table 10 for the correct pipe size for
the furnace. Both the combustion air inlet and the exhaust vent
pipes must attach to the termination kit. The termination kit must
terminate outside the structure and must be installed per the
instructions outlined below for vertical or horizontal termination.

Vertical termination is preferred. Field supplied pipe and fittings are
required to complete the installation.

Figure 44

Figure 46

Kit Components

Concentric Vent Dimensional
Drawing

B PVC
Vent/Exhaust

Kit Contents:
3²² Rain Cap or 2²² Rain Cap
3²² Diameter SDR- 26 Pipe, 191/2² Long or
4²² Diameter SDR- 26 Pipe, 371/8² Long,
2²² Diameter SDR- 26 Pipe, 315/8² Long or
21/2² Diameter SDR- 26 Pipe, 24²² Long,
3²² Y Concentric Fitting or 2²² Y Concentric Fitting

13/16²
C
11/2²

3²² or 4²² Dia.
SDR- 26 Pipe

D
B
PVC Intake/Combustion Air
A

2²² or 3²² Dia.
Rain Cap

2 or 21/2² Dia.
SDR- 26 Pipe

2²² or 3²² Dia.
Y Concentric Fitting

25--22--03

Vertical & Horizontal Termination
1.

Determine the pipe diameters required for the installation
from Table 10 and Table 11 and Figure 46.
Determine the best location for the termination kit. See
Figure 45 for vertical termination or Figure 45 and
Figure 49 for horizontal termination. Roof termination is
preferred since it is less susceptible to damage, has reduced intake contaminants and less visible vent vapor. For
side wall termination, consideration should be given to: 1)
possible damage from the vapors to plants/shrubs, other
equipment and building materials, 2) possible damage to the
terminal from foreign objects, 3) wind effects that may cause
recirculation of flue products, debris or light snow and 4) visible vent vapor.
Cut one 5² diameter hole through the structure for the
NAHA001CV Kit or one 4² diameter
hole for the
NAHA002CV Kit .
Dimension D may be lengthened to 60² max. or shortened
by cutting the pipes to 12² min. Dimension A will change according to D dimension. (See Figure 46)

3.
4.

Concentric Vent Roof Installation

Figure 45

Vent

Maintain 12²² min. clearance above
highest anticipated snow level. Max.
of 24²² above roof.

Combustion
Air

25- 22- 03

Model

D**

NAHA001CV

387/8

41/2

211/8

NAHA002CV

333/8

31/2

167/8

* = Dimension will change accordingly as dimension D is
lengthened or shortened.
** = Dimension D may be lengthened to 60² may also be
shortened by cutting the pipes provided in the kit to 12²
minimum

Table 10

Concentric Termination Kit
NAHA001CV & NAHA002CV Venting
Table for *9MPD Models
50,000, 75,000 & 80,000 Btuh Furnaces

NAHA002CV -- 35¢ & (4) 90° elbows with 2² PVC pipe or
NAHA001CV -- 65¢ & (4) 90° elbows with 3² PVC pipe
100,000 Btuh Furnace
NAHA001CV -- 35¢ & (4) 90° elbows with 3² PVC pipe or
NAHA001CV -- 65¢ & (4) 90° elbows with 3² PVC pipe &
Long Vent Kit (See Tech. Manual)
125,000 Btuh Furnace
NAHA001CV -- 35¢ & (4) 90° elbows with 3² PVC pipe
1. Do not include the field supplied 45° elbow in the total elbow
count.
2. If more than four elbows are required, reduce the length of
both the inlet and the exhaust pipes five feet for each
additional elbow used.
3. Elbows are DWV long radius type for 2² and 3² vents.
NOTE: Feet of pipe is whichever pipe run is the longest, either
inlet or outlet side.

Roof Boot/
Flashing
(Field Supplied)
Support
(Field Supplied)
45°° Elbow
(Field Supplied)

Vent
Combustion
Air

25--22--02

Note:
Support must be field installed to secure termination kit to structure.

440 01 1020 02

Table 11

Concentric Termination Kit
NAHA001CV & NAHA002CV Venting
Table for N9MP2 Models
50,000 & 80,000 Btuh Furnaces

NAHA002CV -- 35¢ & (4) 90° elbows with 2² PVC pipe or
NAHA001CV -- 65¢ & (4) 90° elbows with 3² PVC pipe
75,000 Btuh Furnaces
NAHA002CV -- 20¢ & (2) 90° elbows with 2² PVC pipe or
NAHA002CV -- 35¢ & (4) 90° elbows with 2² PVC pipe &
Long Vent Kit (See Tech. Manual) or
NAHA001CV -- 65¢ & (4) 90° elbows with 3² PVC pipe

!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death,
personal injury and/or property damage.
When using the alternate screw assembly method, drill a
clearance hole in the rain cap and a pilot hole in the vent
pipe for the screw size being used. Failure to drill
adequate holes may cause cracking of the PVC
components, allowing flue gases to be recirculated.

100,000 Btuh Furnace
NAHA001CV -- 35¢ & (4) 90° elbows with 3² PVC pipe or
NAHA001CV -- 65¢ & (4) 90° elbows with 3² PVC pipe &
Long Vent Kit (See Tech. Manual)
125,000 Btuh Furnace
NAHA001CV -- 35¢ & (4) 90° elbows with 3² PVC pipe
1. Do not include the field supplied 45° elbow in the total elbow
count.
2. If more than four elbows are required, reduce the length of
both the inlet and the exhaust pipes five feet for each
additional elbow used.
3. Elbows are DWV long radius type for 2² and 3² vents.
NOTE: Feet of pipe is whichever pipe run is the longest, either
inlet or outlet side.

If assembly needs to be extended to meet height or side wall thickness requirement, the two pipes supplied in the kit may be replaced
by using the same diameter solid, single (no coupling connections)
field supplied SDR--26 PVC (ASTM D2241) pipes. Do not extend
dimension D more than 60². (See Figure 46)
Do not use field supplied couplings to extend the pipes.
Airflow restriction will occur and the furnace pressure switch
may cause intermittent operation.
5.

Partially assemble the concentric vent termination kit. Clean
and cement the parts using the procedures for Joining Pipe
and Fittings section of the manual. A) Cement the Y Concentric fitting to the 4² diameter kit pipe. (See Figure 47) B) Cement the 3² rain cap to the 21/2² diameter kit part. (See
Figure 47) NOTE: A field supplied stainless steel screw
may be used to secure the rain cap to the pipe instead of cementing when field disassembly is desired for cleaning (See
Figure 47)

Figure 47

440 01 1020 02

CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death,
personal injury and/or property damage.
Do not operate the furnace with the rain cap removed as
recirulation of the flue gases may occur. Water may also
collect inside the larger combustion air pipe and flow to
the burner enclosure.
6.

Install the Y concentric fitting and the pipe assembly through
the structure’s hole. For vertical termination, install the parts
through the field supplied roof boot/flashing. NOTE: Do not
allow insulation or other materials to accumulate inside the
pipe assembly when installing through the structure’s hole.

Secure the assembly to the structure as shown in Figure 45
or Figure 49 using field supplied metal strapping or equivalent material.
NOTE: Ensure the termination height is above the roof surface or anticipated snow level as shown in Figure 45 for vertical termination. Ensure the termination location clearance
dimensions are as shown in Figure 48 and Figure 49 for
horizontal termination.

Figure 48

Concentric Vent and Combustion-Air Side Termination
Roof Overhang

Rain Cap to Vent Pipe Assembly
12²² min.
Drill clearance hole in rain
cap and pilot hole in vent pipe.

25--22--02

Stainless steel screw
(Field supplied)

1²² max.
Combustion
Air
Vent

Maintain 12²² clearance above highest anticipated snow level or grade whichever is greater.

25--22--02

Figure 49

Install the rain cap and the small diameter pipe assembly in
the Y concentric fitting and the large pipe assembly. Ensure
that the small diameter pipe is bottomed out and securely
cemented in the Y concentric fitting.

9.
Combustion
Air

Cement the furnace combustion air and vent pipes to the
concentric vent termination assembly. See Figure 45 or
Figure 49 for proper pipe attachment.

Vent

10. Operate the furnace through one heat cycle to ensure combustion air and vent pipes are properly connected to the concentric termination connections.

Concentric Vent Sidewall
Attachment
Strap
(Field Supplied)

Vent

Combustion
Air

Flush to
1²² max.
45°° Elbow
(Field Supplied)

25--22--02

Note:
Securing strap must be field installed to prevent movement of termination kit in side wall.

440 01 1020 02

Four Position Furnace
Models
Single Pipe
N9MP1050B12B1
N9MP1075B12B1
N9MP1080F16B1
N9MP1100F14B1
N9MP1100J20B1
N9MP1125J20B1
or
Two Pipe
N9MP2050B12B1
N9MP2075B12B1
N9MP2080F16B1
N9MP2100F14B1
N9MP2100J20B1
N9MP2125J20B1
or

25--23--30

Dual Certified
*9MPD050F12B1
*9MPD075F12B1
*9MPD080J16B1
*9MPD100J14B1
*9MPD100J20B1
*9MPD125L20B1

*Denotes Brand

International Comfort Products Corporation (USA)
Lewisburg, TN 37091 USA
Fast Parts Division
615--248--8300

Save This Manual For Future Reference
440 01 1020 01

Manufacturers Number (Mfr No --See Rating Plate) ALL Models

Specifications (N9MP1)
N9MP1050B12B

N9MP1075B12B

N9MP1080F16B

N9MP1100F14B

N9MP1100J20B

N9MP1125J20B

General
Gas Type
Input (Btuh)
Output (Btuh)
Transformer Size (VA)
T’stat Heat Anticipator
Temp. Rise (°F)

Nat./ LP
50,000
45,500
40
.10
35--65

Nat./ LP
75,000
68,000
40
.10
40--70

Nat./ LP
80,000
72,000
40
.10
35--65

Nat./ LP
100,000
91,000
40
.10
40--70

Nat./ LP
100,000
96,500
40
.10
40--70

Nat./ LP
125,000
113,750
40
.10
40--70

Electrical (Volts/Hz/FLA)

115/60/9.8

115/60/8.9

115/60/9.0

115/60/10.5

115/60/11.2

Gas & Ignition
Gas Type

Nat.

Gas Valve
Regulation Type
IgnitionType/Series

HW SV9541M
SNAP
HW HSP

Manifold Press. (Inch’s WC)
Std. Main Orifices (No/Size)
Pilot Orifice Size

3.5
2/42
.018

3.5
3/42
.018

3.5
4/44
.018

3.5
4/46
.018

3.5
4/42
.018

3.5
5/42
.018

Fan Controls
Fan Control (Type)
Fan Control
(Timed--secs)

L.P.

10.0
2/54
.011

Nat.

L.P.

10.0
3/54
.011

Nat.

L.P.

10.0
4/55
.011

Nat.

L.P.

Nat.

10.0
4/54
.011

L.P.

10.0
4/54
.011

Nat.

L.P.

10.0
5/54
.011

HW ST9160
30
60,100,140,180

Combustion
Flue Outlet Size (Inches)
Std. Outlet Temp (°5¢ No Elbows)

2
<140

3
<140

Blower Pressure 5¢ No Elbows (² WC)
Blower Pressure 40¢ +5--90° DWV Elbows (² WC)
Transition Bx Pressure 5¢ No Elbows (² WC)
Transition Bx Pressure 40¢ +5--90° DWV Elbows (² WC)

--------2.6
--2.3

--------2.6
--2.5

--1.8
--1.7
--2.6
--2.5

Limits & Controls
Rollout Switch (°F)
Limit Control Setting (°F)

300
240

300
210

300
230

300
220

300
190

Standard Pressure Sw. (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

1013802
--------2.2
--2.0

1013811
--------1.8
--1.6

1013801
--------2.3
--2.1

1013802
--------2.2
--2.0

1013166
--1.3
--1.1
--1.8
--1.6

High Altitude Pressure Sw. (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

1013803
--------2.0
--1.8

1013812
--------1.5
--1.3

1013803
--------2.0
--1.8

1013157
--0.9
--0.7
--1.7
--1.5

Long Vent Kit (Part No)
Pressure Switch (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

-------------------

NAHA001LV
1013518
--1.0
--0.8
--2.0
--1.8

NAHA002LV
1013515
--1.0
--0.8
--1.7
--1.5

-------------------

High Altitude Long Vent Kit (Part No)
Pressure Switch (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

-------------------

11--8
10/850
PSC/1/2
7.5/370
16x25x1
1
1 /2,2,21/2,3

11--8
8.0/1050
PSC/1/2
7.5/370
16x25x1
1
1 /2,2,21/2,3

11--10
10/1050
PSC/1/2
10/370
16x25x1
1
2 /2,3,31/2,4

On
Off

Blower Data
Type & Size
Motor Amps/Rpm
Motor Type/H.p.
Cap. Mfd/Volts
Filter Type & Size (Permanent -- not supplied)
Cool Cap. (Tons) @ .5² W.C. L, ML, MHi & Hi
Gas Conversion Kits
Nat to LP
LP to Nat
*Order from Service Parts

NAHF002LP (*1009509)
NAHF002NG (*1009510)

NAHF003LP
(*1013815)
NAHF003NG
(*1013816)

NAHA003LV
1013165
--0.7
--0.6
--1.4
--1.2
11--10
10/1050
PSC/1/2
10/370
16x25x1
1
1 /2,2,3,31/2,

-------------------

11--10
13/900
PSC/3/4
40/370
16x25x1
1
3 /2,4,41/2,5

NAHF002LP (*1009509)
NAHF002NG (*1009510)

440 01 1020 02

Manufacturers Number (Mfr No --See Rating Plate) ALL Models

Specifications (N9MP2)
N9MP2050B12B

N9MP2075B12B

N9MP2080F16B

N9MP2100F14B

N9MP2100J20B

N9MP2125J20B

General
Gas Type
Input (Btuh)
Output (Btuh)
Transformer Size (VA)
T’stat Heat Anticipator
Temp. Rise (°F)

Nat./ LP
50,000
45,500
40
.10
35--65

Nat./ LP
75,000
68,000
40
.10
40--70

Nat./ LP
80,000
72,000
40
.10
35--65

Nat./ LP
100,000
91,000
40
.10
40--70

Nat./ LP
100,000
96,500
40
.10
40--70

Nat./ LP
125,000
113,750
40
.10
40--70

Electrical (Volts/Hz/FLA)

115/60/9.8

115/60/8.9

115/60/9.0

115/60/10.5

115/60/11.2

Gas & Ignition
Gas Type

Nat.

Gas Valve
Regulation Type
IgnitionType/Series

HW SV9541M
SNAP
HW HSP

Manifold Press. (Inch’s WC)
Std. Main Orifices (No/Size)
Pilot Orifice Size

3.5
2/42
.018

3.5
3/42
.018

3.5
4/44
.018

3.5
4/42
.018

3.5
5/42
.018

Fan Controls
Fan Control (Type)
Fan Control
(Timed--secs)

L.P.

10.0
2/54
.011

Nat.

L.P.

10.0
3/54
.011

Nat.

L.P.

10.0
4/55
.011

Nat.

L.P.

Nat.

10.0
4/54
.011

L.P.

10.0
4/54
.011

Nat.

L.P.

10.0
5/54
.011

HW ST9160
30
60,100,140,180

Combustion
Flue Outlet Size (Inches)
Std. Outlet Temp (°5¢ No Elbows)

2
<140

3
<140

Blower Pressure 5¢ No Elbows (² WC)
Blower Pressure 40¢ +5--90° DWV Elbows (² WC)
Transition Bx Pressure 5¢ No Elbows (² WC)
Transition Bx Pressure 40¢ +5--90° DWV Elbows (² WC)

--------2.6
--2.3

--1.8
--1.3
--2.6
--2.3

--------2.6
--2.5

--1.8
--1.7
--2.6
--2.5

Limits & Controls
Rollout Switch (°F)
Limit Control Setting (°F)

300
240

300
210

300
230

300
220

300
190

Standard Pressure Sw. (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

1013802
--------2.2
--2.0

1013801
--------2.3
--2.1

1013811
--------1.8
--1.6

1013801
--------2.3
--2.1

1013802
--------2.2
--2.0

1013166
--1.3
--1.1
--1.8
--1.6

High Altitude Pressure Sw. (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

1013803
--------2.0
--1.8

1013812
--------1.5
--1.3

1013803
--------2.0
--1.8

1013157
--0.9
--0.7
--1.7
--1.5

-------------------

NAHA001LV
1013518
--1.0
--0.8
--2.0
--1.8

-------------------

NAHA001LV
1013518
--1.0
--0.8
--2.0
--1.8

NAHA002LV
1013515
--1.0
--0.8
--1.7
--1.5

-------------------

NAHA003LV
1013165
--0.7
--0.6
--1.4
--1.2

-------------------

11--8
10/850
PSC/1/2
7.5/370
16x25x1
1
1 /2,2,21/2,3

11--8
8.0/1050
PSC/1/2
7.5/370
16x25x1
1
1 /2,2,21/2,3

11--10
10/1050
PSC/1/2
10/370
16x25x1
1
2 /2,3,31/2,4

On
Off

440 01 1020 02

NAHF002LP (*1009509)
NAHF002NG (*1009510)

NAHF003LP
(*1013815)
NAHF003NG
(*1013816)

NAHA003LV
1013165
--0.7
--0.6
--1.4
--1.2
11--10
10/1050
PSC/1/2
10/370
16x25x1
1
1 /2,2,3,31/2,

11--10
13/900
PSC/3/4
40/370
16x25x1
1
3 /2,4,41/2,5

------------------11--10
13/900
PSC/3/4
40/370
16x25x1
1
3 /2,4,41/2,5

NAHF002LP (*1009509)
NAHF002NG (*1009510)

Manufacturers Number (Mfr No --See Rating Plate) ALL Models

Specifications (*9MPD)
*9MPD050F12B

*9MPD075F12B

*9MPD080J16B

*9MPD100J14B

*9MPD100J20B

*9MPD125L20B

General
Gas Type
Input (Btuh)
Output (Btuh)
Transformer Size (VA)
T’stat Heat Anticipator
Temp. Rise (°F)

Nat./ LP
50,000
46,000
40
.10
35--65

Nat./ LP
75,000
69,000
40
.10
40--70

Nat./ LP
80,000
73,600
40
.10
35--65

Nat./ LP
100,000
92,000
40
.10
40--70

Nat./ LP
125,000
115,000
40
.10
40--70

Electrical (Volts/Hz/FLA)

115/60/9.8

115/60/8.9

115/60/9.0

115/60/10.5

115/60/11.2

Gas & Ignition
Gas Type

Nat.

Gas Valve
Regulation Type
IgnitionType/Series

HW SV9541M
SNAP
HW HSP

Manifold Press. (Inch’s WC)
Std. Main Orifices (No/Size)
Pilot Orifice Size

3.5
2/42
.018

3.5
3/42
.018

3.5
4/44
.018

3.5
4/42
.018

3.5
5/42
.018

Fan Controls
Fan Control (Type)
Fan Control
(Timed--secs)

L.P.

10.0
2/54
.011

Nat.

L.P.

10.0
3/54
.011

Nat.

L.P.

10.0
4/55
.011

Nat.

L.P.

Nat.

10.0
4/54
.011

L.P.

10.0
4/54
.011

Nat.

L.P.

10.0
5/54
.011

HW ST9160
30
60,100,140,180

Combustion
Flue Outlet Size (Inches)
Std. Outlet Temp (°5¢ No Elbows)

2
<140

3
<140

Blower Pressure 5¢ No Elbows (² WC)
Blower Pressure 40¢ +5--90° DWV Elbows (² WC)
Transition Bx Pressure 5¢ No Elbows (² WC)
Transition Bx Pressure 40¢ +5--90° DWV Elbows (² WC)

--------2.6
--2.3

--------2.6
--2.5

--1.8
--1.7
--2.6
--2.5

Limits & Controls
Rollout Switch (°F)
Limit Control Setting (°F)

300
260

300
240

300
220

300
190

Standard Pressure Sw. (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

1013802
--------2.2
--2.0

1013812
--------1.5
--1.3

1013802
--------2.2
--2.0

1013166
--1.3
--1.1
--1.8
--1.6

High Altitude Pressure Sw. (Part No)
Blower Switch Pressure (Close) (² WC)
Blower Switch Pressure (Open) (² WC)
Transition Switch Pressure (Close) (² WC)
Transition Switch Pressure (Open) (² WC)

1013803
--------2.0
--1.8

1013813
--------1.2
--1.0

1013803
--------2.0
--1.8

1013157
--0.9
--0.7
--1.7
--1.5

-------------------

NAHA002LV
1013518
--1.0
--0.8
--2.0
--1.8

-------------------

NAHA003LV
1013165
--0.7
--0.6
--1.4
--1.2

-------------------

11--8
10/850
PSC/1/2
7.5/370
16x25x1
1
1 /2,2,21/2,3

11--10
8.0/1050
PSC/1/2
7.5/370
16x25x1
1
1 /2,2,21/2,3

11--10
10/1050
PSC/1/2
10/370
16x25x1
1
2 /2,3,31/2,4

On
Off

NAHF002LP (*1009509)
NAHF002NG (*1009510)

NAHF003LP
(*1013815)
NAHF003NG
(*1013816)

11--10
10/1050
PSC/1/2
10/370
16x25x1
1
1 /2,2,3,31/2

11--10
13/900
PSC/3/4
40/370
16x25x1
1
3 /2,4,41/2,5

NAHF002LP (*1009509)
NAHF002NG (*1009510)

440 01 1020 02

CIRCULATION AIR BLOWER DATA
For 080 Models 4 Ton 19²² & 223/4² Units

For 050 Models 3 Ton Units
Med L

Med H

Speed
Tap

Low

Med L

Med H

0.1

826

1083

1301

1408

0.1

823

1109

1527

1850

0.2

804

1050

1242

1347

0.2

795

1087

1482

1791

0.3

770

1028

1195

1295

0.3

747

1056

1426

1720

0.4

735

985

1153

1237

0.4

677

1016

1382

1648

0.5

698

952

1093

1183

0.5

617

970

1317

1575

0.6

657

909

1040

1118

0.6

544

854

1245

1485

0.7

------

863

935

1053

0.7

------

763

1154

1401

0.8

--------

812

865

976

0.8

------

652

1043

1284

0.9

------

802

887

0.9

------

905

1161

1.0

------

720

787

1.0

------

737

1028

For 075 Models 3 Ton Units

Exterr
Ex
rrnal
al Stat
atic P
Pres
ssure
re
I hes o
of W
W.C.
Inch

Low

E errna
Exter
al Sta
tatic
c Pres
essur
ure
ches
s of W
W.C.
C.
Inc

Speed
Tap

For 100 Models 5 Ton 223/4² Units

Med L

Med H

Speed
Tap

Low

Med L

Med H

0.1

706

917

1163

1368

0.1

1682

1870

2081

2263

0.2

677

875

1120

1319

0.2

1654

1826

2031

2193

0.3

636

840

1076

1263

0.3

1597

1775

1963

2165

0.4

595

812

1031

1202

0.4

1547

1719

1899

2056

0.5

546

766

987

1148

0.5

1498

1653

1825

1978

0.6

490

702

889

1077

0.6

1428

1583

1737

1854

0.7

------

630

821

989

0.7

1355

1503

1650

1757

0.8

------

550

750

914

0.8

1267

1392

1548

1644

0.9

------

462

676

833

0.9

------

1266

1428

1515

1.0

------

601

747

1.0

------

1351

For 100 Models 3.5 Ton 19²² & 223/4² Units

Ex
xterr
rrnall Stat
atic P
Press
ssure
e
IInche
hes o
of W.
W.C.

Low

E errna
Exter
al Sta
tatic
c Pres
essur
ure
ches
s of W
W.C.
C.
Inc

Speed
Tap

For 125 Models 5 Ton Units

Med L

Med H

Speed
Tap

Low

Med L

Med H

0.1

700

912

1209

1550

0.1

1720

1910

2127

2315

0.2

660

884

1171

1492

0.2

1686

1881

2087

2268

0.3

616

843

1139

1434

0.3

1644

1833

2024

2201

0.4

575

790

1088

1378

0.4

1600

1777

1961

2131

0.5

528

735

1040

1317

0.5

1533

1720

1891

2029

0.6

472

677

979

1247

0.6

1494

1647

1804

1948

0.7

------

608

909

1161

0.7

1413

1571

1708

1820

0.8

------

528

827

1058

0.8

1306

1470

1604

1730

0.9

------

733

932

0.9

--------

1349

1484

1614

1.0

------

624

778

1.0

--------

1328

1430

440 01 1020 02

Ext
xterrn
rnal S
Static
tic Pressu
Pr sure
e
In
nche
es of W.C
.C.

Low

Exte
terrn
nal S
Static
ic Pre
ressu
sure
nches
es off W.C
C.
In

Speed
Tap

GND

NEUTRAL

W
NOTE 2

BLACK-HI
BLUE-MLO
ORANGE-MHI RED-LO

BVSS

2
3

24V

FURNACE
CONTROL

5
6

L1
L1

GND.

4
2

3
1

SENSOR

IGNITER

GAS
VALVE

8 4

1
2
3

5
6
7

ROLLOUT SWITCH
1 TO 3 IN SERIES
DEPENDING ON MODEL

NOTE 2

BVSS
(FIELD INSTALLED)

LP PRESSURE
SWITCH
(LP MODELS ONLY)

NOTE 2

PRESSURE SWITCH
1 TO 2 IN SERIES
DEPENDING ON MODEL

MAIN LIMIT

HUM

EAC

CAPACITOR
(SOME MODELS)

CAPACITOR

BLOWER
MOTOR

THERMOSTAT

4 32 1

R
G Y

N
INDUCER
MOTOR

4321

TRANSFORMER

HUM

EAC

4 3
2 1

GAS
VALVE

LO (R)

MLO (BL)

MHI (O)

HEAT

HI (BK)

NEUTRAL
ON

12
12
12
12
12

FACTORY
SETTING
60 SEC.
100 SEC.
140 SEC.
180 SEC.

IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE
MUST BE REPLACED, IT MUST BE REPLACED WITH TYPE
AWM - 105°C WIRE OR ITS EQUIVALENT.

L1
L1

115V

24VAC

5A
FUSE

COM

COOL

115V-60HZ

1014484

SEE MANUALS FOR ADJUSTING SPEED TAPS FOR PROPER HEATING, COOLING & CIRCULATING SPEEDS.

BLACK BK
BLUE
BL
BROWN BR
GREEN
G
ORANGE O
RED
R
WHITE
W
YELLOW Y
PURPLE P

COLOR CODE

CAPACITOR
(SOME MODELS)

BR
BR

(FIELD INSTALLED)

INDUCER
MOTOR

SPEED TAP CODE

LP PRESSURE
BL
SWITCH
(LP MODELS ONLY)

LINE VOLTAGE FACTORY
LINE VOLTAGE FIELD
LOW VOLTAGE FACTORY
LOW VOLTAGE FIELD
INTERNAL CIRCUIT BOARD WIRING
RECTIFIED AC VOLTAGE FACTORY

NOTE 2

PRESSURE SWITCH
1 TO 2 IN SERIES
DEPENDING ON
MODEL

INTERLOCK
SWITCH

HOT

FAN CONTROL MODULE

BLOWER
MOTOR

HUM

NOTE:
1. MOST VOLT METERS WILL READ 13-16 VOLTS
TO CHASSIS ON BOTH SIDES OF AN OPEN LIMIT
OR PRESSURE SWITCH IN THE RECTIFIED AC
VOLTAGE CIRCUIT
2. FACTORY CONNECTED WHEN BVSS,
(CHIMNEY ADAPTER ACCESSORY KIT) OR LP
PRESSURE SWITCH IS NOT INSTALLED.

COOL

CONT

EAC

THERMOSTAT

CAPACITOR

2 1

FURNACE CONTROL

DATA

HEAT

5A FUSE

6 5

NEUTRAL

COM

ROLLOUT SWITCH
1 TO 3 IN SERIES
DEPENDING ON
MODEL

HEAT ON DELAY: 30 SEC.

24
VAC

3
1

1 GAS VALVE
2
3
4

4 3 2 1

5
6
7
8

1 2 3 4

24V SECONDARY

SENSOR

W BK

P
IGNITOR

LADDER DIAGRAM

5 6 7 8

TRANSFORMER

INTERLOCK
SWITCH

MAIN LIMIT

WARNING: ELECTRICAL SHOCK HAZARD
DISCONNECT BEFORE SERVICING

COOL ON DELAY: 5 SEC
COOL OFF DELAY: 90 SEC

115V PRIMARY

COPPER
CONDUCTORS
ONLY

115V
60HZ

HOT

FIELD
CONNECTION
BOX

CONNECTION DIAGRAM

1. Wiring Diagram

HEAT OFF DELAY

440 01 1020 02

2
H

25--23--95

2. N9MP1, N9MP2 or *9MPD

Replacement Parts - N9MP1 & N9MP2
Models -- N9MP1050B12B1, N9MP1075B12B1, N9MP1080F16B1, N9MP1100F14B1, N9MP1100J20B1 &
N9MP1125J20B1 -- N9MP2050B12B1, N9MP2075B12B1, N9MP2080F16B1, N9MP2100F14B1, N9MP2100J20B1 &
N9MP2125J20B1 (Natural Gas)
Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description

Functional

Part
Number

N9MP1

N9MP2

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

Heat Exchanger, Primary

1012847
1012851
1012855
1012856
1012859

1
-----

-1
----

--1
---

---1
--

----1

1
-----

-1
----

--1
---

---1
--

----1

Heat Exchanger, Secondary

1013760
1013761
1013764
1013765
1013766

1
-----

-1
----

--1
---

---1
--

----1

1
-----

-1
----

--1
---

---1
--

----1

Motor, Blower

1009052
1013341
1011906

1
---

-1
--

1
---

-1
--

--1

1
---

-1
--

1
---

-1
--

--1

Mount, Motor kit

1013379
522020024

1
--

-1

1
--

-1

Wheel, Blower

1013011
1011420

1
--

-1

1
--

-1

Transformer

1012722

Capacitor, 10Mfd, 370V
7.5Mfd., 370V
40Mfd., 370V

1171729
1171728
1171982

1
---

-1
--

1
---

-1
--

--1

1
---

-1
--

1
---

-1
--

--1

Control, Fan Timer

1014460

Switch, Interlock

1171981

Switch, Pressure

1013802
1013811
1013801
1013166

1
----

-1
---

--1
--

1
----

---1

1
----

--1
--

-1
---

--1
--

1
----

---1

Blower, Exhaust (Jakel)

1014338
1014341

1
--

-1

1
--

-1

Valve, Gas HSP Nat.

1013350

Burner, Pilot HSP

1008731

Igniter/Sensor HSP

1009524

Orifice, Burner #42 Nat.
#44 Nat.

1011351
1011352

2
--

3
--

-4

4
--

5
--

2
--

3
--

-4

4
--

5
--

Switch, Limit (Rollout)

1013102

Burner Assembly

1008723
1008724
1008725
1008726

1
----

-1
---

--1
--

---1

1
----

-1
---

--1
--

---1

Switch, Limit (Main)

34335001
34335002
1320361
1008445
1320367

-1
----

1
-----

--1
---

----1

---1
--

-1
----

1
-----

--1
---

----1

---1
--

Orifice, Pilot .018

503211

440 01 1020 02

Description

Part

No.

Non-- Functional

Number

N9MP1

N9MP2

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

Panel, Top

1012323
1012324
1012325
1012326
1012957
1012958
1012959

1
-------

-1
------

--1
-----

---1
----

----1
---

-----1
--

------1

Gasket, Top Panel

1012602
1012603
1012604

1
---

-1
--

--1

1
---

-1
--

--1

Partition, Blower

1171983
1171984
1171985
1172004
1172005
1172006

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Housing, Blower

1012972
1012888

1
--

-1

1
--

-1

Panel, Blower Cutoff

721020013
721020008

1
--

-1

1
--

-1

Hanger, Blower

1012328

Door, Blower

1013684
1013685
1013686
1013687
1013688
1014239

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Bracket, Door Filler

1013679
1013680
1013681

1
---

-1
--

--1

1
---

-1
--

--1

Door, Front

1014146
1014147
1014256
1014257
1014258
1014259

1
------

-1
-----

--1
----

---1
---

----1
--

-----1

Strap, Capacitor

1170643
1014315

1
--

-1

1
--

-1

Transition Assembly

1012280
1012281
1012282

1
---

-1
--

--1

1
---

-1
--

--1

Gasket, Blower

1014425

Board, Insulating

1012417
1012418
1012419

1
---

-1
--

--1

1
---

-1
--

--1

Box, Collector

1012128
1012244
1012245

1
---

-1
--

--1

1
---

-1
--

--1

Gasket, Transition

1013079
1013080
1013083

1
---

-1
--

--1

1
---

-1
--

--1

Gasket, Collector Box

1012593
1012594
1012595

1
---

-1
--

--1

1
---

-1
--

--1

Partition, Front Ht Exchanger

1012646
1012647
1012649
1012651
1012652

1
-----

-1
----

--1
---

---1
--

----1

1
-----

-1
----

--1
---

---1
--

----1

440 01 1020 02

Description

Part

No.

Non-- Functional

Number

N9MP1

N9MP2

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

Gasket, Attachment Plate

1012542
1012543
1012544
1012545

2
----

-2
---

--2
--

---2

2
----

-2
---

--2
--

---2

Cover, Junction Box

1012350

Box, Junction

1012349

Tube, Pilot

1013077
1012832
1012834

--1

-1
--

1
---

--1

-1
--

1
---

Bracket, Pilot

1010901

Manifold

1012276
1012277
1012278
1012279

1
----

-1
---

--1
--

---1

1
----

-1
---

--1
--

---1

Bottom, Burner Box

1012334
1012335
1012336

1
---

-1
--

--1

1
---

-1
--

--1

Baffle, Burner Box

1012338
1012339
1012340

1
---

-1
--

--1

1
---

-1
--

--1

Top, Burner Box

1013702
1013703
1013704

1
---

-1
--

--1

1
---

-1
--

--1

Bracket, Manifold Support

1012377

Bracket, Burner Box Side

1012532

Bracket, Control Mounting

1013677

Tube, Sensor

1009238

Trap, Drain Assembly

1171917

Sightglass

1012756

Gasket, Trap

1013701

Bracket, Trap

1171986

Gasket, Trap Bracket

1171987

Tube, Drain Coll. Box 5/8² ID

1171988

Tube, Drain Tee 1/2² ID

1171989

Tube, Relief

1009238

Drain Vent

1014003

)(

PART NOT ILLUSTRATED

)(

Door Screws

1014488

)(

Door Screws Grommets

1171990

)(

Clamp, Hose 3/4²

1012976

)(

Clamp, Hose 5/8²

1012975

)(

Grommet, Vent

1012697

)(

Bushing, Strain Relief

1945287

)(

Harness, Wire

1013716
1013718
1013719

1
---

-1
--

--1

1
---

-1
--

--1

)(

Trap, Drain Tee

1171916

)(

Tube, 1/2² ID Drain
Tube, 1/2² ID Elbow
Coupling, 1/2² Barbed
Tubeing, 5/8² ID Drain
Connector, 3/4² X 1/2²

1171991

1171992

1171993

1171994

1171995

)(
)(
)(
)(

440 01 1020 02

Key

Description

Part

No.

Non-- Functional

Number

N9MP2

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

050B
12B

075B
12B

080F
16B

100F
14B

100J
20B

125J
20B

1171996

)(

PART NOT ILLUSTRATED

)(

Elbow, 1/2² CPVC Street

)(

Grommet, Casing

1171997

)(

Tube, Releif Ext.

1009238

)(

Connector, Releif Tube

1171998

)(

Plate, Cover

1171999

)(

Gasket, Cover Plate

1172000

)(

Cap, Drain Tee

1172001

)(

Clamp, Tee Cap

1172002

)(

Coupling, Air Intake

1012284

)(

Gasket, Air Intake

1012583

)(

Gasket, Trap

1013701

)(

Grommet, Vinyl (Gas Inlet)

1009535

)(

Bushing, Strain Relief

1945287

)(

Installation Manual

44001102000

)(

User’s Manual

44102201000

*1009509
*1009510
*1013815
*1013816

1
1
---

--1
1

1
1
---

--1
1

1
1
---

Gas Conversion Kits
Nat to LP
NAHF002LP
LP to Nat
NAHF002NG
Nat to LP
NAHF003LP
LP to Nat
NAHF003NG
* Order from Service Parts

Replacement Parts - *9MPD
Models -- *9MPD050F12B1, *9MPD075F12B1, *9MPD080J16B1, *9MPD100J14B1, *9MPD100J20B1 & *9MPD125L20B1
(Natural Gas)
*Denotes Brand

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Keyy
N
No.

Description
p
F ti l
Functional

Heat Exchanger, Primary

Heat Exchanger, Secondary

Motor, Blower

Mount, Motor kit

Wheel, Blower

6
7

Transformer
Capacitor, 7.5Mfd.,370V
10Mfd.,370V
40Mfd.,370V

8
9

Control, Fan Timer
Switch, Interlock

440 01 1020 02

Part
Number
N
b

*9MPD
050F12B

075F12B

080J16B

100J14B

100J20B

125L20B

1012850
1012854
1012858
1012862
1013762
1013763
1013765
1013767
1009052
1013341
1011906

1
---1
---1
---

-1
---1
---1
--

--1
---1
-1
---

--1
---1
--1
--

--1
---1
---1

---1
---1
--1

1013379
522020024
1013011
1011420
1012722
1171928
1171929
1171982

1
-1
-1
-1
--

-1
-1
1
1
---

-1
-1
1
-1
--

-1
-1
1
1
---

-1
-1
1
--1

1014460
1171981

1
1

Replacement Parts - *9MPD
Models -- *9MPD050F12B1, *9MPD075F12B1, *9MPD080J16B1, *9MPD100J14B1, *9MPD100J20B1 & *9MPD125L20B1
(Natural Gas)
*Denotes Brand

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Keyy
N
No.

Description
p
F ti l
Functional

Switch, Pressure

Blower, Exhaust (Jakel)

12
13
14
15
16
17

Valve, Gas HSP Nat.
Burner, Pilot HSP
Igniter/Sensor HSP
Orifice, Burner #42 Nat.
#44 Nat
Switch, Limit (Rollout)
Burner Assembly

Switch, Limit (Main)

Orifice, Pilot .018

Key
No.

Part
Number
N
b

*9MPD
050F12B

075F12B

080J16B

100J14B

100J20B

125L20B

1013802
1013812
1013166

1
---

-1
--

1
---

--1

1014388
1014341
1013350
1008731
1009524
1011351
1011352
1013102
1008723
1008724
1008725
1008726
1320366
34335002
1008445
1320367
503211

1
-1
1
1
2
-2
1
---1
---1

1
-1
1
1
3
-2
-1
---1
--1

1
-1
1
1
-4
2
--1
----1
1

1
-1
1
1
4
-2
--1
----1
1

-1
1
1
1
5
-2
---1
--1
-1

Description
Non- Functional

Part
Number

*9MPD
100J14B

100J20B

125L20B

Panel, Top

1012866
1012867
1012868

1
---

-1
--

--1

Gasket, Top Panel

1012603
1012604
1012605

1
---

-1
--

--1

Partition, Blower

1172008
1172005
1172006
1172007

1
----

-1
---

--1
--

---1

Housing, Blower

Panel, Blower Cutoff

K
L

Hanger, Blower
Door, Blower (Tempstar only)
(Tempstar only)
(Tempstar only)
(Comfortmaker/Keeprite only)
(Comfortmaker/Keeprite only)
(Comfortmaker/Keeprite only)
(Heil/Arcoaire only)
(Heil/Arcoaire only)
(Heil/Arcoaire only)
Bracket, Door Filler

1012972
1012888
721020013
721020008
1012328
1014155
1014170
1014192
1014152
1014167
1014189
1014262
1014263
1014264
1013680
1013681
1014494

1
-1
-2
1
--1
--1
--1
---

-1
-1
2
1
--1
--1
--1
---

-1
-1
2
-1
--1
--1
--1
--

-1
-1
2
--1
--1
--1
--1

1014154
1014169
1014191
1014151
1014166
1014188
1014265
1014266
1014267

1
--1
--1
---

-1
--1
--1
--

--1
--1
--1

M
N

Door, Front (Tstar only)
(Tstar only)
(Tstar only)
(Cmaker/Keeprite only)
(Cmaker/Keeprite only)
(Cmaker/Keeprite only)
(Heil/Arco only)
(Heil/Arco only)
(Heil/Arco only)

050F12B

075F12B

080J16B

440 01 1020 02

Replacement Parts - *9MPD
Models -- *9MPD050F12B1, *9MPD075F12B1, *9MPD080J16B1, *9MPD100J14B1, *9MPD100J20B1 & *9MPD125L20B1
(Natural Gas)
*Denotes Brand

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.

Description
Non- Functional

Part
Number

*9MPD
050F12B

075F12B

080J16B

100J14B

100J20B

125L20B

1170643
1014315
1012281
1012282
1012283

1
-1
---

1
--1
--

-1
-1
--

-1
--1

Clamp, Capacitor

Transition Assembly

Q
R

Gasket, Blower
Board, Insulating

1014425
1012418
1012419
1012420

1
1
---

1
-1
--

1
--1

Box, Collector

1012244
1012245
1012246

1
---

-1
--

--1

Gasket, Transition

1013263
1013080
1013083
1013084

1
----

-1
---

--1
--

---1

Gasket, Collector Box

1012594
1012595
1012596

1
---

-1
--

--1

Partition, Frt Ht Exchanger

1012650
1012648
1012651
1012653

1
----

-1
---

--1
--

---1

Gasket, Attachment Plate

1012542
1012543
1012544
1012545

2
----

-2
---

--2
--

---2

X
Y
Z

Cover, Junction Box
Box, Junction
Tube, Pilot

1012350
1012349
1012832
1013077
1012834

1
1
--1

1
1
1
---

1
1
-1
--

AA
BB

Bracket, Pilot
Manifold

1010901
1012276
1012277
1012278
1012279

1
1
----

1
-1
---

1
--1
--

1
---1

Bottom, Burner Box

1012334
1012335
1012336

1
---

-1
--

--1

Baffle, Burner Box

1012338
1012339
1012340

1
---

-1
--

--1

Top, Burner Box

1013702
1013703
1013704

1
---

-1
--

--1

FF
GG
HH
JJ
KK
LL

Bracket, Manifold Support
Bracket, Burner Box Side
Bracket, Control Mounting
Tube, Sensor
Trap, Drain Assembly
Sightglass Comfortmaker & Heil
Tempstar Only
Gasket, Trap
Bracket, Trap
Gasket, Trap Bracket
Tube, Drain Coll. Box 5/8² ID

1013677
1012532
1013677
1009238
10171917
1013235
1013236
1013701
1171986
1171987
1171988

2
2
1
1
1
1
1
1
1
1
1

QQ
RR
SS
TT

440 01 1020 02

Replacement Parts - *9MPD
Models -- *9MPD050F12B1, *9MPD075F12B1, *9MPD080J16B1, *9MPD100J14B1, *9MPD100J20B1 & *9MPD125L20B1
(Natural Gas)
*Denotes Brand

Replacement part supplied will be current active part. For parts not listed, consult place of purchase.
Key
No.
UU
VV
WW
YY

Description
Non- Functional
Tube, Drain Tee 1/2² ID
Tube, Relief
Drain Vent
Tee, Drain

)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(

PART NOT ILLUSTRATED
Door Screws
Door Screws Grommets
Coupling, Air Intake
Gasket, Air Intake
Clamp, Hose 3/4²
Clamp, Hose 5/8²
Coupling, Discharge
Clamp Hose
Grommet, Vent
Bushing, Strain Relief
Grommet, Vinyl (gas Inlet)
Harness, Wire

)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(
)(

Trap, Drain Tee
Tube, 1/2² ID Drain
Tube, 1/2² ID Elbow
Coupling, 1/2² Barbed
Tubeing, 5/8² ID Drain
Connector, 3/4² X 1/2²
Elbow, 1/2² CPVC Street
Grommet, Casing
Tube, Releif Ext.
Connector, Releif Tube
Plate, Cover
Gasket, Cover Plate
Cap, Drain Tee
Clamp, Tee Cap
Installation Manual
User’s Manual

Gas Conversion Kits
Nat to LP
NAHF002LP
LP to Nat
NAHF002NG
Nat to LP
NAHF003LP
LP to Nat
NAHF003NG
* Order from Service Parts

Part
Number

*9MPD
050F12B

075F12B

080J16B

100J14B

100J20B

125L20B

1171989
1009238
1014003
1171915

1
1
1
1

1014488
1171990
1012284
1012583
1012976
1012975
1002522
1013830
1012697
1945287
1009535
1013716
1013718
1013719

4
4
1
1
2
2
2
4
1
1
1
1
---

4
4
1
1
2
2
2
4
1
1
1
-1
--

4
4
1
1
2
2
2
4
1
1
1
--1

1171916
1171991
1171992
1171993
1171994
1171995
1171996
1171997
1009238
1171998
1171999
1172000
1172001
1172002
44001102000
44102201000

1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1

1
1
---

--1
1

1
1
---

*1009509
*1009510
*1013815
*1013816

440 01 1020 02

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : Yes
Create Date                     : 2003:04:29 08:44:31
Producer                        : Acrobat Distiller 4.05 for Windows
Modify Date                     : 2003:04:29 08:51:49-05:00
Page Count                      : 56

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